A man purchases 2 watches for $ 600. He sells one at 15% profit and the other at a loss of 10%. He neither gains nor loses on the whole. Thus, the cost price of two watches are :  Answers.
A) $ 260 and $ 300 B) $210 and $ 350 C) $240 and $360 D) $560 and $560 E) $224 and $ 350
x + y = 600 --- (1)   1.15x + 0.9y = 600 --- (2)   (2) - (1) --&gt; 0.15x - 0.1y = 0   15x = 10y   x/y = 2/3 = (2*120)/(3*120) = 240/360   Answer: $240 and $360
<result>C</result>
A man purchases 2 watches for $ 600. He sells one at 15% profit and the other at a loss of 10%. He neither gains nor loses on the whole. Thus, the cost price of two watches are :