Question

by selling an article for rupees 1600 A shopkeeper losses 20% for how much should he sell it to gain 20%

Answer 1

Let us first calculate CP of the article.
So, Let CP be x.
x-20% of x = 1600
x-x/5 = 1600
4x/5 = 1600
x = 1600*5/4 = 2000.
Now,
Gain = 20%
So, SP = 2000 + 20% of 2000
i.e. 2000 +400 = 2400.
So, To gain 20%, he should sell the article
in Rs 2400.

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Answer 2

2400 should he sell it to gain 20%