Finding the original number
A car is sold for `£360` after a discount of `20%`. Find the original price.
`£360` after a discount of `20%` is the same as saying `£360` is `80%` of the original price.
Multiply both sides by `360` to get `x` on its own (remember – what ever you do to one side you do to the other).
`x=(100timescancel360\ \ \ 4.5)/cancel80`
Answer: The original price is `£450`