Question

After a 35% discount, a book costs $11.21, what is the normal
undiscounted price of the book?

Answer 1

The normal undiscounted price of the book is $17.25.

Explanation:

This question can be solved using a rule of three.

After a 35% discount, a book costs $11.21

This means that $11.21 is 100-35 = 65% = 0.65 of the original price x.

How much is x, which is 100% = 1?

$11.21 - 0.65

$x - 1

`0.65x = 11.21`

`x = (11.21)/(0.65)`

`x = 17.25`

The normal undiscounted price of the book is $17.25.