Question

Which of the following expressions could be used to find 80% of X (the lines are there to show the different expressions)

Answer 1

80/100 times x =>
`(80)/(100)*x`

(0.8) times x =>
`(0.8)*x`

4/5 times x =>
`(4)/(5)*x`

8/10 times x =>
`(8)/(10)*x`

Explanation:

80% of x means 80 ÷ 100 × x

that is:
`(80)/(100)*x = (8)/(10)*x = (4)/(5)*x = (0.8)*x`

Therefore, the expressions that can be used to find 80% of x are:

80/100 times x =>
`(80)/(100)*x`

(0.8) times x =>
`(0.8)*x`

4/5 times x =>
`(4)/(5)*x`

8/10 times x =>
`(8)/(10)*x`