When a quantity grows (gets bigger), then we can compute its PERCENT INCREASE:
[beautiful math coming... please be patient] <span><span>PERCENT INCREASE=<span><span>(new amount−original amount)</span>original amount</span></span><span>PERCENT INCREASE=<span><span>(new amount−original amount)</span>original amount</span></span></span>
Some people write this formula with <span><span>100%</span><span>100%</span></span>
at the end, to emphasize that since it is percent increase, it should be reported as a percent.
Recall that <span><span>100%=100⋅<span>1100</span>=1</span><span>100%=100⋅<span>1100</span>=1</span></span>
. So, <span><span>100%</span><span>100%</span></span>
is just the number <span>11</span>
! Multiplying by <span>11</span>
doesn't change anything except the name of the number! Hope this helps