the 6th of the 7th month (July) to the ninth of the 1st month (January?) answer 31 is 9d.5 13 Tell the interest of 240l. for 1 year and 135 days, at 7 per cent. per annum ? answer 231 os 3d. 14 What is the interest of 3711. for 1 year and 213 days, at 6 per cent. per annum? answer 351 58 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 75 3d. 16 Required the interest of a bond for 1481 12s 6d. for I months, at 6 per cent. per annum ? ans. 81 35 3d. 17 What sum will a bond of 333 135 3d. amount to in 77 months, at 6 per cent. per annum ? ans. 3621 os 6d. 18 A father left a legacy to his daughter of 651/ 11. 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 0 2d. 19 What interest is due on a legacy of 517/ 125 8d •for 5 years, 1 months, and 25 days, at 6 per cent. per annum? answer 1851 175 9d. 20 What is the interest of one farthing for 5794 years, at answer 8s 5d. 21 A owes B the following sums, with the interest on them, at 6 per cent. per annum, viz. 6ol. for 7 months; 150%. for 15 months; 751 10s. for 9 months? 145 15s. for 27 months, and 397/ 125. for 45 months; what is the amount of the principal and interest? answer 9551 14s 6d. 7 per cent. per annum ? 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. 1 A factor has disbursed upon his employer's account the sum of 1009l. 18s. what must be demanded for his commission; at 24 per cent.? z What is the insurance of an East India ship and cargo, valued at 74061 17s 6d. at 154 cent? answer 11661 115 7d. 3 Suppose 1 per cent. be allowed for commission; what must be demanded on 704/ 155 4d.? 4 What is the brokage of 700! 14s 6d. per cent.? answer 121 6s 8d. at 4s. per cent. answer il 8s od. 5 What may a broker demand on 52c/ 12s 6d. at 6s 4d. answer 11 6s 7d. 6 The value of a ship and cargo is 8560odols. what is the insurance, at 35 per cent.? answer 29960 dols. CASE 5. To find the principal, when the amount, time and rate per cent. are given; RULE. RULE. As the amount of 100%. at the rate and time given, Is to 100%. So is the amount given To the principal required. EXAMPLES. What principal at interest for nine years, at 5 per cent. per annum, will amount to 725/?. As 1451. 100l. :: 7251.: 500l. answer. 2 What sum at interest for 9 years and 6 months, at 4 per cent. per annum, will amount to 856/ 10s.? ans. 600l. CASE 6. To find the rate per cent. when the amount, time, and principal are given, As the principal, RULE. Is to the interest of the whole time ; So is 100l. To its interest for the same time. Divide the interest last found by the time, and the quotient will be the rate per cent. EXAMPLES. At what rate per cent. per annum, will 500l. amount to 7251. in 9 years? 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. EXAMPLES. I In what time will 500l. amount to 7251. at 5 per cent. per annum? £. $500 5 £. 25/00 725 500 25)225(9 years, answer. 2 In what time will 600l. amount to 8561 10. at 4 per cent. per annum? answer gyr. 6mo. 3 A testator left his son, besides providing for his edu cation, &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 11 years, 9 months A TABLE |
