Question

a grocer purchased 80kg of rice at the rate of rs.16.75 per of and mixed it with 120kg of rice, purchased at rs.18per kg.at what rate per kg must he sell the mixture to have a 20% gain?

Answer 1

In this question , first we have to find the average price of the 80 kg rice and 120 kg rice .

And the average is

$\frac{80*16.75 +120*18}{80+120} = \frac{3500}{200} = 17.5$

So the average price is Rs 17.50 per kg .

And it is given that gain percent = 20

So he sells at a price of

$\frac{120}{100}* 17.50 = 21$