Let MP of the article = ? N
? SP of the article = N x (100 - 10)/100 = ? 9N/10
? CP of the article = [(9N/10) x 100]/(100 + 20)
= (9N x 10)/120
= ? 3N/4
Now, new SP of the article = [N x (100 - 20)]/100 = ? 4N/5
New profit = 4N/5 - 3N/4 = (16N - 15N)/20 = ? N/20
Hence, profit per cent = [(N/20) / (3N/4)] x 100 %
= (4 x 100)/(3 x 20) %
= 62/3%
Let MP of the article = ? N
? C P of the article = (N x 64) / 100 = ? 16N/25
And SP of the article = [N x (100 - 12)]/100 = ? (N x 22)/25
? profit = [ 22N/25 - 16N/25 ] = ? 6N/25
Hence, profit per cent = [(6N/25) / (16N/25)] x 100%
= (6 x 100)/16 = 37.5%
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