Question

Janelle’s hair was 16.8 cm at the beginning of the school year. At the end of the year, the length of her hair had increased by 2.5%. How much did her hair grow during the year?

Answer 1

The hair grow at the end of year (17.22 cm - 16.8 cm) = 0.42 cm

Explanation:

Given in the question as:

The height of hair of Janelle's at the beginning of school = 16.8 cm

The length of hair increased by 2.5%

Let the length of hair after increment = x

So, x = 16.8 cm + 2.5 % of 16.8 cm

Or, x = 16.8 cm × ( 1 +
`(2.5)/(100)`)

Or, x = 16.8 cm × (
`(102.5)/(100)`

∴ x = 17.22 cm

Answer