Question

Original price is $40 and the sale price is $30. what is the percent decrease?

Answer 1

`(new - original)/(original)`

=
`(30 - 40)/(40)`

=
`(- 10)/(40)`

=
`(-1)/(4)`

= - 0.25

= 25% decrease (negative sign = decrease, positive sign = increase)

Answer: 25%