A man sells a horse for Rs.680 and loses something, if he had sold it for Rs.980, his gain would have been double the former loss. Find the cost price of the horse?  Choose the most appropriate option.
A) 287
B) 679
C) 780
D) 860
E) 898
780P = SP + 1780P = SP - g   680 + x = 980 - 2x   3x = 300 =&gt; x   = 100   780P = 680 + 100= 
<gadget id="calculator">680 + 100</gadget>
<output>780</output>
780   Answer:780
<result>C</result>
A man sells a horse for Rs.680 and loses something, if he had sold it for Rs.980, his gain would have been double the former loss. Find the cost price of the horse?