Question

increase Rs. 815 by 50 percent

Answer 1

50 % of 815 = 50/100*815
1/2*815=407.5
Therefor on increasing 815+407.5=1322.5

Answer 2

If we increase Rs. 815 by 50%,
it will become = 100+50 = 150%

So it will be = 815 * 150/100 = Rs. 1322.5