213 cent. per the 6th of the 7th month fJuly) to the ninth of the lat month (January ?) answer 31 is gd. 13 Tell the interest of 240l. for 1 year and 135 days, at 7 per cent. per annum? answer 232 es 34. 14 What is the interest of 3711. for r year and days, at 6 per cent. per annum? answer 351 5. od. 15 What is the interest of a bond for 3251 155 6d. for year and 73 days, at 7 per cent. per annum? answer 271 4s 3d. I 16 Required the interest of a bond for 1481 128 6d. for II months, at 6 per cent, per annum? ans. 81 35 3d.net 17 What sum will a bond of 3331 135 3d.amount to in 37 months, at 6 per annum ? ans. 3621 os 6d. 18 A father left a legacy to his daughter of 6511 111. te be at interest until she attained the age of eighteen ; at his decease she was 15 years and 219 days old; what sum must she call on her executor for, interest computed a 7 per cent. per annum? answer 7611 o 2d. 19 What interest is due on a legacy of 5171 125 8d I for 5 years, aļ months, and 25 days, at 6 per cent. per an answer 1851 175 9d. 20 What is the interest of one farthing for 5794 years, at 7 per cent. per annum? answer is 5d. 21 A owes B the following sums, with the interest on them, at 6 per cent. per annum, viz. bol. for 7 months; 1501. for 15 months ; 757 ros. for 9 months ? 1451 155. for 27 months, and 3971 125. for 451 months ; what is the amount of the principal and interest? answer 9554 14.5 6d. num? CASE 4. INSURANCE, COMMISSION, and BROKAGE. Insurance, commission and brokage, are allowances made to insurers, factors, or brokers, at a stipulated rate per cent. RULE. For the insurance or commission, work as if to find the interest of the given sum, at the proposed rate for 1 year ; and and for the brokage, divide the sum by 100, and take such aliquot parts of the quotient, as the brokage is of a pound. EXAMPLES. I A factor has disbursed upon his employer's account the sum of 1oogl. 18s. what must be demanded for his commise sion ; at 2 per cent.? £. A. d. 1009 18 ans. 23 14 5 2 2019.16 4, 22172 56 20 's. '14145 112 d. 5146 gr. 1184 2 What is the insurance of an East India ship and cargoy valued at 74061 178 6d. at 154 cent? answer 11661 11s 7d. 3 Suppose il per cent. be allowed for commission; what must be demanded on 7041 155 4d.? answer 12l 6s 8d. 4 What is the brokage of 700l 14s 6d. at 45. per cent. answer il 8s odos 5 What may a broker demand on 52cl 125 6d. at 6s 4d. Answer il 6s 7d. 6 The value of a ship and cargo is 8560odols. what is the insurance, at 35 per cent.? answer 29960 dols. per cent.md CASE 5. To find the principal, when the amount, time and rate per cent. are given; RULE. RULE. EXAMPLES. r What principal at interest for nine years, at 5 per cent. per annum, wlll amount to 7251.?. Am 45 100 As 1451. : 100l. :: 7251 : sool. answer.. 2 What sum at interest for 9 years and 6 months, at 4 per cent. per annum, will amount to 8561 10s.? ans. 6ool. CASE 6. To find the rate per cent. when the amount, time, and principal are given, RULE. Divide the interest last found by the time, and the quotient will be the rate per cent. EXAMPLES 1 At what rate per cent. per annum, will sool. amount to 7251. in 9 years ? 725 500 9) As sool. : 2251. ;: 100l. : 45 answer 5 per cent. 2 At what rate per cent, will 6oodols. amount to 856dols. 50 cents, in 9 years and 6 months ? answer 4 per cent. CASE 7. To find the time, when the principal, amount and rate per cent are given ; RULE. Divide the whole interest by that of the principal for one year; and the quotient will be the time required. EXAMP L E S... i In what time will sool. amount to :7251. at 5 per cento per annum? to 500 725 5 500 £: 25100 25)225(9 years, answer. 2 In what time will 600l. amount to 8561 10. at 41 per cent. per annum? answer gys. Omo. 3 A testator left his son, besides providing for his education, &c. 2000 dols. to receive the amount thereof at 5 per cent, when he should arrive at the age of 21 years, which his guardian then found to be 2925 dols. how old was the boy at his father's decease ?, answer ir years, 9 months A TABLE Dey. оооо I оооооооооооооооооо 20 I 13 4 3 6 8 34 A TABLE at any rate per cent, s. d. 5o I III 2 2 O 13 4 OIS O 3 IO 7 82 2 O 1925 % 8 3 33 I 6 II I IO 97 4 42 04 II 1 18 5 5 5$ 200 3 16 IT O IO II 300 5 15 43 O 16.5 I III I 12 rok I 18 45 15 1 81 2 3 Io 75 % 93 19 4 7 % 14 93 38 9 2 5 9 7 76 18 32 10 19 25 96 3 0 13 13 II 6000 500 оо II57 81 16 8 7000 583 68 134 12 31 19 3 8000 153 16 11 25 18 9000 750 00 173 I 61 24 13 833 68 192 6 Il 27 7 136 19 3. IO 6 13 4 |