Samant bought a microwave oven at a discount of 10%. He then sold it at a profit of 30%. What percentage of profit did Samant earn on the original price?
17%
Let the original price = Rs.100
Then, C.P. = Rs.90, S.P. = 130% of Rs.90 = Rs.(130100×90)=Rs.117
∴ Required percentage = (117 - 100)% = 17% .