Question

A grocer purchased $65kg$ of rice at Rs.16 per kg and mixed it with $85kg$ of rice at Rs. 12 per kg. At what rate per kg should he sell the mixture approximately to gain $20\%$?

Answer 1

Total price $=\left(65\right)\left(16\right)+\left(85\right)\left(12\right)$$=Rs.2,060.$

Total no. of kg's$=85+85=150kg$

Price of one $kg=\frac{2060}{150}=13.73Rs$. per kg

For $20\%$ gain

$13.73+\frac{20}{100}\left(13.73\right)=\frac{120}{100}\times 13.73$

$16.48Rs.$ per kg