By selling 12 marbles for a rupee a shopkeeper loses 20 In order to gain 20 in the transaction he sh...........

Quantitative Aptitude ( CCS) Profit and loss

By selling 12 marbles for a rupee, a shopkeeper loses 20% . In order to gain 20% in the transaction , he should sell the marbles at the rate of how many marbles for a rupee?

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Explanation:

Solution:
SP of 12 marbles = Rs.1 , loss = 20%
CP of 12 marbles = Rs. (1/0.8) = Rs. 1.25
SP of 12 marbles at a gain of 20%
CP * 1.2 = 1.25 *1.2
= Rs. 1.5
It means in order to gain 20%, he should sell 12 marbles for Rs.1.5
For Rs. 1 , he should sell 12/1.5 = 8 marbles