By selling 100 mangoes, a fruit seller gains the C.P of 20 mangoes. Find his gain?

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20%

80%

60%

90%

answer is A.

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Detailed Solution

Concept: A relationship between the cost price and total gain is presented in this question, but we are required to calculate the gain without being given the precise values of C.P. or S.P. Using this relationship, we can calculate the gain percentage after first calculating the entire cost and profit for 100 mangoes. So, apply this idea to the problem at hand in order to find a solution.
If the cost of a mango is x, then the cost of 100 mangoes is x.
Considering the stated situation, Gain is equal to 20 times the cost of 20 mangoes.
We are aware that the formula gain percent =gain/C.P100 yields the gain percent.
Consequently, the growth percentage for 100 mangoes is