Problem Solving Using Percents 11.2 Problem Solving Using Percents

Percent: out of 100; per 100; part of 100 30% means 30 out of 100 Percent Problems: a is p percent of b

a=part b=whole is means = of means multiply p=percent

You will know 2 of the 3 parts to solve the problems.

#1 What is 15% of 25? You don’t know the part.

#2 13 is 62% of what number? Don’t know whole or base. Divide by 62 n=20.97

#3 125 is what percent of 86? Don’t know percent. Divide by 86 p=145.3%

*Remember to move decimal 2 places to change decimal to %

Percent of increase or decrease 1. Find the difference between the original and final amount 2. Divide the difference by the original amount. Increase/decrease % of change = Original

Example: If the retail cost of a bike helmet is $38.95, and its wholesale cost is $22.75, what is the percent of markup?

71% increase