EXAMPLES 1. What principal, being put to intereft for 4 years, at 4 per cent. per annum, will amount to 2741. 78. od? 2. What principal being put to intereft, for 5 years, at 4 per cent. per annum, will amount to 4671. 168. 3d.? Anf. 3751. 3. What principal being put to intereft, for 74 years, at 34 per cent. per annum, will amount to 2191 88. ižd. ? Anf. l. 775.5.34 When the principal, rate per cent. and amount are given, to find the time. RULE. R U L E. State, as the intereft of the principal for 1 year : is to one year fo is the whole intereft required. EXAMPLE S. to the time 1. In what time will 690l. amount to 7771. 19s. 6d. at 44 per cent. per annum.? £.. s. d. y. £. S. d. In what time will 420l. amount to 520l. 16s. at 3 per cent. per annum? Anf. 8 years. 3. In what time will 100l. double itself, at 4 per cent. per annum? Anf. 25 years. In what time will 350l. amount to -4451. 118. 10d. at 44 per cent. per annum? Anf. 54 years. When the principal, amount, and time are given, to find the rate per cent. State, as the principal whole time is to the intereft for the fo is 100l. to the intereft for the fame time. Then, divide the intereft by the given time, and the quotient will be the rate per cent. required. EXAMPLE S. 1. At what rate per cent. per annum will 6201. amount to 7931. 128. in 7 years ? £ s. 793 12 As 620: 173 12: : 100 4 2. At what rate per cent. per annum will tool. double itself in 20 years? Anf. 5 per cent. 3. At what rate per cent. per annum will 4981. 6s. 8d. amount to 614l. 3s. 11d. in 74 years? Anf. 3 per cent. 4. At what rate per cent. per annum will 350l. amount to 470l. 10s. 7d. in 74 years? Anf. 4 per cent. COMMISSION. Commiffion is an allowance made by the merchant to his factor or correfpondent for buying or felling goods for him, and is generally at fo much per cent. If the commiffion be under one per cent., divide the given fum by 100, and take aliquot parts, from the quotient, with the commiffion; if it be above one per cent. work by cafe ift of fimple intereft; if it be to be paid in a different way, it must be calculated as the agreement specifies. Brokerage and infurance are both calculated in the fame manner as commiffion. EXAMPLE S. 1. What is the commiffion of 3071. 16s. 8d. at 2. Suppose I allow my correfpondent 24 per cent. for his commiffion; what is his demand for laying out 5751. 178. 2d. ? Ani. 12l. 198. 1, 77d. 3. My factor writes me word that he has bought goods for me to the amount of 6951. 10s. 8d; what will his commiffion come to at 3 per cent.? Anf. 261. 19. 74, d. 4, If I allow my agent 17 per cent.; how much will be due to him for difburfing 3831. 118. 11d. on my account? Anf. 71. 38. 10, d. 5. I demand the commiffion of 3751. 11s. 8d. at d. per pound? Anf. fol. 11s. 34, d. |