We are given:
We need to find the percentage of discount.
Discount=MP−SP=1500−1200=300
Discount %=(Discount/MP)×100
Discount %=(300/1500)×100
Discount %=(3/15)×100
Discount %=(1/5)×100
Discount %=100/5
Discount %=20
20%
The percentage of discount is 20%.