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.

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