• question_answer Raman bought a geyser at $\frac{9}{10}$th of its marked price and sold it at 8% more than its marked price. His gain per cent is A)  8                     B)  10    C)  18                    D)  20

Let the marked price of the geyser be Rs. 100. $CP=Rs.\,\,\frac{9}{10}\times 100=Rs.\,\,90$ and $SP=108%\,\,of\,\,Rs.100=\,\,Rs.\left( \frac{108}{100}\times 100 \right)=\,\,Rs.\,\,108$Gain = Rs. $(108-90)=\,\,Rs.\,\,18$ Gain per cent$=\left( \frac{18}{90}\times 100 \right)=20%$