A man purchases 2 mobiles for $ 1400. He sells one at 20% 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 the most appropriate option
A) $ 600 and $ 1400	B) $1400 and $ 600	C) $600 and $800	D) $800 and $600	E) $1400 and $ 800
x + y = 1400 --- (1)   1.20x + 0.85y = 1400 --- (2)   (2) - (1) --&gt; 0.20x - 0.15y = 0   15x = 10y   x/y = 3/4= (3*200)/(4*200) = 600/800   Answer: $600 and $800
<result>C</result>
A man purchases 2 mobiles for $ 1400. He sells one at 20% 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 :