Home > MC2 > Chapter 9 > Lesson 9.2.3 > Problem9-66

9-66.

Calculate the percent change in each problem below.

1. Robert wanted to buy a computer game that cost $\25$ last week. This week when he went back to buy the game, the price was $\35$. What was the percent of increase in the price?

Find the increase in the price and find it as a percentage of the original price.

Increase: $\35-\25=\10$

$\10=(x)(\25)$

2. Susan bought a jacket on sale. The original price of $\35$ was marked down to $\25$. What was the percent discount because of the sale?

Follow the same strategy to find the percent discount. Remember, the percent discount is with respect to the original price.

$28.6\%$

3. Why were your answers to parts (a) and (b) different?

The percent increase is the amount the price increased as a percentage of the original cost.

Each percentage is based on a different original price.