If the cost price of 30 books is same as the selling price of 20 books, then the gain percentage is:
Given:
Cost Price of 30 books (CP of 30) = Selling Price of 20 books (SP of 20)
Concept Used:
Gain = Selling Price (SP) - Cost Price (CP)
Gain Percentage = × 100
Solution:
Let the Cost Price of 1 book be ₹C and the Selling Price of 1 book be ₹S.
Given: 30C = 20S
3C = 2S
S = C
Gain per book = S - C = C - C = C
Gain Percentage = × 100
Gain Percentage = × 100
Gain Percentage = 50%
Alternate Method:
30 CP = 20 SP
Profit = 30 - 20 =10
Profit % =
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