Answer to Question #238691 in Financial Math for Serfa

Question

Sales at LL Boutique decreased 10% this month compared to last month. If sales this month were $130,581, what were the sales (in $) last month?

Answer 1

Sales figure for last month = $x$

Sales figure for this month = $130581

Since sales dropped by 10% compared to last month, then

10% = 0.1

$\frac{x - 130581}{x} = 0.1$

$x-130581 = 0.1x$

$x-0.1x = 130581$

$0.9x = 130581$

= $145090

The sales figure for last month were $145090