Ajay sells goods to a customer at a profit of K % over the marked price, besides it he cheats his customer by giving 880g only instead of 1kg. Thus his overall profit percentage is 25%. Find the value of K.  Choose the correct choice from the following options
A) 8.33% B) 8.25% C) 10% D) 12.5% E) None of these
Let C.P. of 1000g = Rs. 1000   Profit % = K %   Profit = K/100 x 1000 = Rs.10 K   He then cheats his customer by giving 880g only instead of 1kg,   So, C.P of 880g = Rs. 880   S.P. of 880g = 1000 + 10K   Profit % = [ ( 1000 + 10K - 880 ) / 880 ] x 100 = 25   K = 10%   ANSWER:10%
<result>C</result>
Ajay sells goods to a customer at a profit of K % over the marked price, besides it he cheats his customer by giving 880g only instead of 1kg. Thus his overall profit percentage is 25%. Find the value of K.