Robert's salary was decreased by 60% and subsequently increased by 60%. how much percentage does he lose?  Choose the correct choice from the following answers:
A) 10%
B) 20%
C) 25%
D) 36%
E) 50%
let original salary be $100   Salary after decreasing 60% = 100 - 100 x 60/100 = $40   Salary after increasing 60% on $40 = 40 + 40 x 60/100 = $64   Percentage of loss = 100 - 64= 
<gadget id="calculator">100 - 64</gadget>
<output>36</output>
36%   Answer : 36%
<result>D</result>
Robert's salary was decreased by 60% and subsequently increased by 60%. how much percentage does he lose?