6.4 Adding and multiplying percents
Adding and multiplying percents
Knowing how to add and multiply percentages is very useful in our daily life. Do you know how much sales tax you are going to pay for your new purchases? What is the sale price after discount? How do banks calculate interest? We will learn more in this section.
Basic concepts:
 Applications of percents
 Percents, fractions, and decimals
Lessons

2.
When Kim was in grade 5, she was 130 cm tall. In grade 6, she was 20% taller than last year. In grade 7, her height has increased by 15%.