Use a 70% discount coupon
OR
a 40% discount, 20% discount, then 10% discount coupon
on your entire purchase?
h/t @robertkaplinsky
Whichever answer you choose, justify your reasoning with mathematics.
If you would like a version of the image without the percents so you can manipulate them easier, please let me know.
Use a 70% discount coupon
use a 70% discount because a 40% discount then 20% discount then 10% discount is wayyyy to much
70% discount