A grocer mixes 10 kg of tea at ₹60 per kg with 5 kg at ₹75 per kg and sells the mixture at ₹78 per kg. What is his profit per cent?

Explanation

1. 01

   Cost of the mixture: $\frac{600 + 375}{15} = 65$ rupees per kg.

2. 02

   Profit $= 78 - 65 = 13$ on 65, that is $\frac{13}{65} \times 100 = 20\%$.