The price of your favorite brand of jeans was $35 last month. This month the price is $42. What is the percent of change from last month to this month?
The price increase is:
$42 - $35 = $7
The percentage price increase is:
( $7 / $35) • 100%
( 7 / 35 ) • 100% =
( 7 • 1 / 7 • 5 ) • 100% =
( 1 / 5 ) • 100% = 0.2 • 100% = 20%