Question

what expression can be used to find total discount of 30%

Answer 1

If you want to find a price of something after being discounted by 30%
Then
30/100 x The price of the item
Example;):
Price of 20$ after being discounted by 30%
so,
30/100 x 20
= 6
We now know the total which is going to be discounted so
20-6 = 14$