We are told that our friend earns $10.50 per hour this year which is 125% of her last year's hourly wage. We can find what number's 125% is equal to $10.50 to find her last year's hourly wage. Recall that the percent proportion is a proportion that sets the ratio of a part of a whole equal to the ratio of a percent out of 100. We can represent a is p percent of wwith the given proportion.
part/whole=percent/100 ⇔ a/w=p/100We can find what number's 125% is $10.50 by thinking about 125 as the percent and 10.5 as a part of the whole. Let's substitute a= 10.5 and p= 125 into the formula and solve for w using the Properties of Equality.
