A man purchases 2 watches for $ 540. 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 :
Choose the correct answer:  A) $ 260 and $ 300  B) $216 and $ 324  C) $224 and $336  D) $560 and $560  E) $224 and $ 350
x + y = 540 --- (1)   1.15x + 0.9y = 540 --- (2)   (2) - (1) --&gt; 0.15x - 0.1y = 0   15x = 10y   x/y = 2/3 = (2*108)/(3*108) = 216/324   Answer: $216 and $ 324
<result>B</result>
A man purchases 2 watches for $ 540. 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 :