Question

An insurance agent receives a salary of GHC550.00 and 2% commission on all sales over GHC8500.00. If his total income in a particular month was GHC1225.00, what was the amount of his sales for that month
income = .02(sales over 8500) + 550

1225 = .02(s - 8500) + 550
675 = .02s - 170
.02s = 845
s = 42250 <----- total sales

check:
amount of sales over 8500 = 42250 - 8500 = 33750
commission = .02(33750) = 385
income = 675 + 550 = 1225

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