Question

A coal merchant makes a profit of 20% by selling coal at Rs.25 per quintal. If he sells the coal at Rs.22.50 per quintal, what is his profit percent on the whole investment?

• A. $6\%$
• B. $6.66\%$
• C. $7.5\%$
• D. $8\%$

Answer 1

The correct option is D $8\%$

$Profit\%=20\%,$ $SP=25$

$CP=\frac{25}{120}\times 100=\frac{125}{6}\text{Rs.}=20.83$

$Profitif\text{SP}=22.50$

$=22.50-20.83=1.667$

$Profit\%=\frac{1.667}{20.83}\times 100=8\%$
[in fractional term this can be solved very easily]