Robert's salary was decreased by 30% and subsequently increased by 30%. how much percentage does he lose?	Choose the most appropriate option.
A) 10% B) 9% C) 25% D) 30% E) 50%
let original salary be $100   Salary after decreasing 30% = 100 - 100 x 30/100 = $70   Salary after increasing 30% on $70 = 70 + 70 x 30/100 = $91   Percentage of loss = 100 - 91= 
<gadget id="calculator">100 - 91</gadget>
<output>9</output>
9%   Answer : 9%
<result>B</result>
Robert's salary was decreased by 30% and subsequently increased by 30%. how much percentage does he lose?