1. The marked price of a shop keeper for an article is 30% higher than the cost price. If he sells the article allowing 10% discount to customers, then the gain percent will be :
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SP = 0.9*1.3CP
%gain = $$frac{SP-CP}{CP} imes100$$
= $$frac{(0.9*1.3CP)-CP}{CP} imes100$$
= 17%