Question

A person saves 20% of his income. if his income increases by 40% and he decides to save 30% of his income, by what per cent has his saving increased?

Answer 1

let us assume the income=100 rs
then 20% of savings (s 1)=20 rs
increased income by 40%=140 rs
new savings of 30% (s 2)=42 rs
s 1:s 2=20:42=10:21
                         10:(10+11)
                                      11=10+1
so 110% of 10 is 11
so, savings increased by 110%