Question

Sales at LL Boutique decreased 10% this month compared to last month. If sales this month were $139,581, what were the sales (in $) last month?

Answer 1

Sales figure for last month = $x$

Sales figure for this month = $139581

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

10% = 0.1

$\frac{x - 139581{}}{x} = 0.1$

$x{-139581{}}{} = 0.1x$

${x-0.1x{}} = 139581$

${0.9x{}} = 139581$

= $155090

The sales figure for last month were $155090

${check{}}:$

$\frac{155090 -139581{}}{155090} ×100$

$=\frac{15509{}}{155090}×100$

= 10%