What is 20% of $60?
20% is mutiplied by $60:
20% × $60 = (20/100) × $60 = 0.2 × $60 = $12
$12 is what percent of $60?
$12 is divided by $60 and multiplied by 100%:
($12 / $60) × 100% = 20%
$12 is 20% of what?
$12 is divided by 20%:
$12 / 20% = ($12 / 20) × 100 = $60
What is the percentage change from $40 to $50?
The difference between $50 and $40 is divided by $40 and multiplied by 100%:
[($50 - $40) / $40] × 100% = 0.25 × 100% = 25%