By selling a watch for Rs.640/-, a man loses 20% what is that watch cost price?
Choose the correct choice from the following.
A) Rs. 600/-	B) Rs. 700/-	C) Rs. 800/-	D) Rs. 850/-	E) Rs. 900/-
80 % ------&gt; 640 (80 * 8 = 640)   100 % ------&gt;800 (100 * 8 = 800)   Cost price = Rs. 800/-   Rs. 800/-)
<result>C</result>
By selling a watch for Rs.640/-, a man loses 20% what is that watch cost price?