her monthly allowance is $50
Step-by-step explanation:
let her monthly allowance = x
$5 = 10% of her monthly allowance
5 = 10% × x
5 = 0.1 × x
5 = 0.1x
Divide both sides by 0.1:
5/0.1 = 0.1x/0.1
50 = x
Hence, her monthly allowance is $50
$50 is correct