The output of a factory was increased by 10% to keep up with rising demand. To handle the holiday rush, this new output was increased by 10%. By approximately what percent would the output now have to be decreased in order to restore the original output?
Select:
A) 20%
B) 24%
C) 30%
D) 32%
E) 17%
The original output increases by 10% and then 10%.   Total % change = a + b + ab/100   Total % change = 10 + 10 + 10*10/100= 
<gadget id="calculator">10 + 10 + 10*10/100</gadget>
<output>21</output>
21%   Now, you want to change it to 0, so,   0= 21 + x + 21x/100   x = -21(100)/121 = 17% approximately   Answer is 17%
<result>E</result>
The output of a factory was increased by 10% to keep up with rising demand. To handle the holiday rush, this new output was increased by 10%. By approximately what percent would the output now have to be decreased in order to restore the original output?