A man purchases 2 watches for $ 400. He sells one at 10% profit and the other at a loss of 15%. He neither gains nor loses on the whole. Thus, the cost price of two watches are :	Choose one:	A) $ 260 and $ 300	B) $210 and $ 350	C) $160 and $240	D) $400 and $80	E) $224 and $ 350
x + y = 400 --- (1)   1.10x + 0.85y = 400 --- (2)   (2) - (1) --&gt; 0.10x - 0.15y = 0   10x =15y   x/y = 15/10= (2*80)/(3*80) =160/240   Answer: $160 and $240
<result>C</result>
A man purchases 2 watches for $ 400. He sells one at 10% profit and the other at a loss of 15%. He neither gains nor loses on the whole. Thus, the cost price of two watches are :