Exercise 3 Page 181

Let's start by recalling that a percent of change is a ratio that compares the change in quantity to the original amount. If the original quantity is increased, then it is called a percent of increase. If the original quantity is decreased, then it is called a percent of decrease. To determine the percent of change, we can use the following formula. Percent of change =Amount of change/Original amount We know that Tyler bought the comic book for $ 49.62 last year, and he sold it for $ 52.10 this year. We can find the amount of change by subtracting the less value from the greater one. Amount of change = $ 52.10 - $ 49.62 = $ 2.48 Now let's use the formula to find the percent of change. To make the math easier, we can ignore the units for now.

To write the decimal as a percent, we need to move the decimal point two places to the right and write the percent symbol.

We found that the percent of change of the price of the comic book is about 5 %.