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    				| 1. | 
                                    At what per cent above the cost price must a shopkeeper mark his goods so that he gains 20% even after giving a discount of 10% on the marked price. (a) 25% (b) 30%(c) \(33\frac{1}{3}\)%(d) \(37\frac{1}{2}\)% | 
                            
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Answer»  (c) 33\(\frac{1}{3}\)% Let the M.P. be Rs x. Discount = 10% \(\therefore\) S.P. = 90% of Rs x = Rs \(\frac{9X}{10}\), Profit = 20% C.P = \(\frac{\frac{9X}{10}\times100}{120}\) = \(\frac{3}{4}\)x \(\therefore\) Reqd. percent = \(\frac{\big(X-\frac{3}{4}X\big)}{\frac{3}{4}X}\)x 100 = \(\frac{100}{3}\)% = 33\(\frac{1}{3}\)%  | 
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