By selling a watch for Rs.720/-, a man loses 20% what is that watch cost price?  Choose the correct choice from the following choices:
A) s. 600/-	B) s. 700/-	C) s. 800/-	D) s. 850/-	E) s. 900/-
80 % ------&gt; 720 (80 * 9= 720)   100 % ------&gt;900 (100 * 9 = 900)   Cost price = Rs. 900/-   s. 900/-)
<result>E</result>
By selling a watch for Rs.720/-, a man loses 20% what is that watch cost price?