Question

$800,000 to $900,000. What is the approximate percent increase?

Answer 1

It's 12.5%:

http://www.hackmath.net/en/calculator/percentage?a1=&b1=&submit1=Calculate&a2=&b2=&a3=&b3=&a4=&b4=&a5=&b5=&a6=&b6=&a7=&a8=800000&b8=900000&b9=

I calculate it as (900-800)/800*100 = 12.5 %

Answer 2

(900,000 - 800,000) / (800,000)
100,000/800,000 = 0.125
0.125 * 100 = 12.5%

yep..you got it