Question

The monthly salary S of a shop assistant is the sum of a fixed salary of $500 plus 5% of all monthly sales. What should the monthly sales be so that her monthly salary reaches $1500?

Answer 1

Given the monthly salary S of a shop assistant is the sum of a fixed salary of $500 plus 5% of all monthly sales.

Let S be the total monthly salary and x be the monthly sales, hence

S = 500 + 5% * x

Find sales x so that S = 1500, hence

1500 = 500 + 5% * x = 500 + 0.05 x

Solve for x

x = (1500 - 500) / 0.05 = $20000

$20000 is monthly sales