A man purchases 2 watches for $ 7650. He sells one at 25% profit and the other at a loss of 20%. He neither gains nor loses on the whole. Thus, the cost price of two watches are : Pick one:
A) $ 3400 and $ 7650 B) $7650and $ 4250 C) $3400 and $4250 D) $7650 and $3400 E) $2240 and $ 3500
x + y = 7650 --- (1)   1.25x + 0.8y = 7650 --- (2)   (2) - (1) --&gt; 0.25x - 0.2y = 0   25x = 20y   x/y = 4/5 = (4*850)/(5*850) = 3400/4250   Answer: $3400 and $4250
<result>C</result>
A man purchases 2 watches for $ 7650. He sells one at 25% profit and the other at a loss of 20%. He neither gains nor loses on the whole. Thus, the cost price of two watches are :