• # question_answer 61. A dealer sells a radio set at Rs. 900 and makes 80% profit on his investment. It he can sell it at Rs. 200 more, his profit as percentage of investment will be; A) 160                              B) 180C) 100                              D) 120

Let principle value of radio = Rs. X  $900=X\,(1+0.8)$ $X=500$ Net profit $=900+200$             $=500\,\,(1+y)$ $y=\frac{1100}{500}=1.2\,\,or\,\,120%$