L&T Company Numerical Ability Profit and Loss

In a certain store, the profit is 250% of the cost. If the cost increases by 30% but the selling price remains constant, approximately what percentage of the selling price is the profit?
A)59% B)76% C)63% D)82%

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L&T Other Question

A, B and C can do a piece of work in 30, 60 and 20 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?
A)21 days B)18 days C)20 days D)15 days
Two candidates appeared at an examination. One of them secured 12 marks more than the other and his marks was 60% of the sum of their marks. The marks obtained by them are:
A)42, 30 B)56, 44 C)36, 24 D)48, 36