Question

Which is a better deal?

40% off of a textbook that costs $89
OR a used copy of the same textbook for $39.99

Answer 1

probably the $39.99 one it's a bit more cheaper

Answer 2

40% off of a textbook that costs $89

= 89 - 89x40% = 53,40

so better to get the used copy for £39.99