Question

A shopkeeper bought 2 calculators each at the same price. He sold one for Rs.66 and gained 10%. At what price should he sell the second calculator so as to earn a profit of 15% ?

Answer 1

Dear student
$$\begin{gathered} C.Pofeachcalculator=\left[\frac{100}{100+Gain\%}\times S.P.\right]=\left[\frac{100}{100+10}\times 66\right]=Rs60 \\ S.Pofsecondcalculator=\left[\frac{100+Gain\%}{100}\times C.P.\right]=\left[\frac{100+15}{100}\times 60\right]=Rs69 \\ So,heshouldsellthesecondcalculatoratRs.69soastoearnaprofitof15\%. \end{gathered}$$