If selling price is doubled, the profit triples. Find the profit percent.
Answer: B
Cost price be \(Rs. x\) and Selling price be \(Rs. y.\)
Then, \(3(y - x) = (2y - x) \)
\(\Rightarrow y = 2x\)
Profit \(= Rs. (y - x) = Rs. (2x - x) = Rs. x.\)
\(\therefore\) Profit % \(= (\frac{x}{x} \times 100)\) % \(= 100\) %
Please log in or register to report this question.
\(Two \) Mangoes, \(three \) grapes and \(four \) apples cost \(Rs. 15.\) \(Three\) Mangoes, \(two\) grapes and \(one\) apple cost \(Rs. 10.\) I bought \(3\) Mangoes, \(3\) grapes and \(3\) apples. How much did I pay?
Answer: B
Mango \(= X;\) Grape \(= Y;\) Apple \(= Z;\)
\(2X + 3Y + 4Z= 15 - 1\)
\(3X + 2Y + Z = 10 - 2\)
Adding (1) and (2) \(5X + 5Y + 5Z = 25\)
Clearly, \(X + Y + Z = 5\)
So cost of \(3\) Mangoes, \(3\) Grapes and \(3\) Apples will be \(3X + 3Y + 3Z \) \(i.e, 15\)
Please log in or register to report this question.
