Question

a man used to save 28% of his income. when his income increased, he increased his expenditure by 25/2% and then saved 25% of his income. find the percentage increase in his income.

Answer 1

let income of person be 100
savings 28% of 100= 28
expenditure 100-28= 72
expenditure increased by 25/2% ( 12.5%)
so 72+ 12.5% of 72= 81 new expenditure
new savings 25%
so exp+sav=inc
81+25%inc=inc
by solving equation we get
inc=108

so increase is 8%