A persons salary iis decreased by steps of 20%, 15% and 10%. What will be the percentage decrease, if the salary is decreased in a single shot?	Choose the correct choice from the following answers.
A) 34.8%
B) 36.8%
C) 38.8%
D) 39.8%
E) 32.8%
Let x is his initial salary.   After 1st decrease, x1 = x- (x*20/100) = x - x/5 = 4x/5   After 2nd decrease, x2 = 4x/5 - ((4x/5)*15/100) = 4x/5 - 3x/25 = 17x/25   After 3rd decrease, x3 = 17x/25 -((17x/25)*10/100) = 17x/25 - 17x/250 = 153x/250   So if its decreased in single shot, x - y(decreased) = 153x/250   =&gt; y = x - 153x/250 =&gt; y = 97x/250 =&gt; y = 0.388x =&gt; y = 38.8%   ANSWER:38.8%
<result>C</result>
A persons salary iis decreased by steps of 20%, 15% and 10%. What will be the percentage decrease, if the salary is decreased in a single shot?