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(50) The sum of 7431. 48. 9d. is payable in 6 years' time,

and the present value of that sum is 5877. 78. 02d. I demand at what rate per cent. the rebate must be made.

LXXII. PURCHASING FREEHOLD or REAL

ESTATES IS to find the present worth of an annuity, &c. to continue

for ever.

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EXAMPLES. (51) Suppose a freehold estate of 500l. per annum were to

be sold ; what is the worth, allowing 5 per cent. to the

buyer? (52) What is an estate of 251. per annum, to continue for

ever, worth in present money, allowing 44 per cent, to
the buyer?
When P and U are given, to find R.

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THEOREM 21.

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EXAMPLES. (53) Suppose one gave 10,0001. for a freehold estate of 5001.

per annum, what rate per cent. has the purchaser for

his money? (54) If an estate of 25), per annum be bought for 555l. 11.50

ljd., what is the rate per cent, ?

When P and R are given, to find U.
Theorem 22. Por-T=0.

EXAMPLES. (55) Suppose a person would lay out 100001. na freehold

estate, and so as to be allowed 5 per cent. for his money, what must be the annual rent of such an estate?

(56) If a freehold estate be bought for 5557. 1 18. 14d. and the

allowance of 4 per cent. be niade to the buyer, what is the yearly rent?

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RULE.

Tazorem 23. Thus 1. Find the worth of the

yearly rent, &c. 2. Change Pinto A, and find

what principal being put to interest will amount to A,

A at the same rate, and for Thus the time to come before the estate commences.

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EXAMPLE. (57) What is an estate of 500l. per annum worth in ready

money, to continue for ever, but not to commence till the end of 4 years, allowing 5 per cent, to the purchaser ?

To find the yearly rent of an estate taken in reversion.

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EXAMPLE (58) A freehold estate is sold for 82271. ls. 4d, which does

not commence till the end of 4 years, the buyer being allowed 5 per cent. for his money: I desire to know the

yearly income.

QUESTIONS for Exercise. (59) Ileld of a college 4861. 10s. a-year, on a reserved rent

of 941. Money being at 5 per cent. interest; what fine ought severally to be paid on a 7, a 14, and a 21

years' lease? (60) Suppose I would add five years to a running lease of 15

years io come, the improved rent being 1961. 7s. 6d. per annum; what ought I to pay down in ready money

for this favour, discounting 4 per cent. ? (61) A. has a term of 7 years in an estate of 501. per annum;

B. has a term of 14 years in the same estate; and C. has a farther term of 10 years after B. in the same estate. What is the present value of the several in

terests in the said estate? (62) For a lease of certain profits for 7 years, A. offers to pay.

1501. gratuity, and 3001. per annum; B. offers 4001. gratuity, and 2501. per annum; C. bids 6501. gratuity, and 2001. per annum; and D. offers 18001. for lhe whole purchase, without any yearly rent. Query, which is the best offer? and what difference,

computing at 4 per cent. ? (63) Value the lease of a house in tolerable repair, the rent

546. 175. a-year, the ground rent 7 guineas; 3 years of it only to come; the rent payable every 6 months ; discount per compound interest on this kind of purchase

at 101. per cent. (64) A fine for a lease of a tenement is settled at 1531. under

a reserved rent of 161. a-year. Now the tenant cannot conveniently pay more than 501.; but for ihe 6 years to come of the term, is willing rather to pay an adequate rent, computing 10l. per cent. per compound

interest. What ought that rent to be? (65) Another lease for 7 ytais is agreed for at 2501. Fine,

on the old rent 441. a-year; but considering the contractor desires to reduce the rent to 201. a-year, and pay a proper fine, computing as before, after the rate of 101. a-year; to what must the fine be advanced?

on, previcus to bis marriage, is inclined to have 501. a-year freehold settled on his family; and to have immediate possession of it, offers his father, in lieu, an annuity for his life, valued at 12 years'

(60) A

purchase, discounting at 4 per cent. thereon: whereas he is content the estate should be valued at a discount of 3 per cent. and consequently will be worth 33} years' purchase. Pray what had the father for

his life? (67) A gentleman took a college lease of 2371. a-year, for 21

years, and paid the full fine : the rent reserved was 101. a-year; but when 4 years were elapsed, against his marriage, he renewed the lease, and filled up the 21 years. In 14 years after that, his wife dying, he again renewed it in favour of his daughter, then 7 years of age ; and by the time she was 19, it was a Third time renewed in order to her settlement. The question is, what money the society must have received from this family from first to last, allowing 5l. 2-year discount on the fines.

PART IV.

LXXIV. MENSURATION.

GEOMETRICAL DEFINITIONS:

GEOMETRY contains the nature and properties of lines, angles, surfaces, and solids.

A point is that which has no parts nor magnitude.
A line is length conceived without breadth.

An angle is the mutual inclination of two lines which meet.

When a straight line, a3 CD (Fig. 4.), standing upon another, A B, makes the angles, ADC, and CDB, on each side equal to one another, each of these equal angles is called a right angle, and the dotted line, CD, is said to be perpendicular to the line A B.

An angle is commonly expressed by three letters; that placed at the angular point being always wrote in the middle, as ADC (Fig. 4,) denotes the angle b.

An obtuse angle is that which is greater than a right angle, as CAB (Fig. 3.).

An acute angle is that which is less than a right angle, as DCB (Fig. 4.).

Paraliel lines are those of which every point of the one is at the same distance from the other, as the lines A B and CD (Fig. 2.).

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