A seller buys 240 Television. He sells some of them at a gain of 20% and the remaining at a gain of 30%. If he gains 28% on the whole, then how many did he sell at a gain of 20%?
Show answer & explanation
Correct answer: C
Explanation
Let the number of televisions sold at a 20% profit be x.
Number of televisions sold at a 30% profit = 240 − x
20x + 30(240 − x) = 28 × 240
20x + 7200 − 30x = 6720
480 = 10x
x = 48