Question

1 a. Rhian measures the height of one of her tomato plants as 20 cm. Next week it is 15% taller. What is its new height?

1 b. Another tomato plant grows from 240 cm to 312 cm. Calculate the percentage change in height.

Answer 1

1a. The new height of the tomato plant is 23cm.

To find this, we need to find what 15% of 20 is and then add it to the 20. To find 15% of 20, we multiply.

15% * 20 = 3

Now we add that to 20 to get the final answer.

20 + 3 = 23

1b. The new tomato plant grew 30%.

In order to find this, we need to use the percent change formula. The formula is below for you.

(New - Old)/Old * 100 = %Change

(312 - 240)/240 * 100 = %Change

72/240 * 100 = %Change

.3 * 100 = %Change

30% = %Change