Question

When a bush was first planted in a​ garden, it was 12 cm tall. After two​ weeks, it was 120% ​% as tall as when it was first planted. Use mental math to find how tall the bush was after the two weeks.

Answer 1

The bush was 12 cm tall initially, and after two weeks it grew to 120% of its original height, which is 14.4 cm.

Step-by-step explanation:

When the bush was first planted, it was 12 cm tall. After two weeks, it was 120% as tall as when it was first planted. To find how tall the bush was after two weeks, we will calculate 120% of the original height. To do this using mental math, remember that 100% of a number is the number itself, so 100% of 12 cm is 12 cm. Then, to find 20%, we find 10%, which is 1.2 cm, and double it to get 2.4 cm. Adding this on to the original 12 cm, we get 14.4 cm, which is 120% of the original height. Therefore, the bush was 14.4 cm tall after two weeks.