A man spend 75% of his income. when his income is increse by 20%. He increse his expenditure 10% . By what percent are his saving increse ?

Answer 1

Original income= I

.25I=Savings original
.15(I*1.20)=new savings.

percent increase= (New-old)/old * 100
= (.18I-.25I)/.25I * 100

It appears his savings decreased.