To find the answer, you have to make a proportion.
Percent of discount = discount / regular price
d = 45 / 225
d =0.2
So to covert 0.2 to a percent, move the decimal point 2 places to the right.
= 20%
( By the way, 45 is $225 - $180)
To check it, I'm gonna multiply $225 * 0.20 = 45
And then subtract 225 - 45 = 180
So the discount percent is 20%
