Question

A shopkeeper makes a profit of 20% on selling a transistor radio for Rs. 840. For how much should he sell another transistor radio, whose cost price is Rs. 25 more than the first one, to make the same percentage profit ?

Answer 1

Case 1:
S.P of transistor=840 Rs.
Profit=20%
Then $C.P.=\left(\frac{100}{120}\right)\times 840=700Rs.$
Case 2:
C.P.of transistor =700+25=725 Rs.
Profit=20%
Then$S.P=\left(\frac{120}{100}\right)\times 725=870Rs.$