Question

Mr hari spends 66% of his salary on his family . 20% of the remaining he gives to a trust for charity and is left with 12240 RS . what is the total salary of Mr hari ?? and how much amount does he give to the trust ?

Answer 1

Let  Salary = S
Spent on family = 0.66 * S
Remaining = S - 0.66 S =  0.34 * S 
given to the trust =  0.20 * 0.34 *S = 0.068 * S

What is left = 0.80 * (0.34 * S)  =  0.272  S

               0.272 * S = 12, 240 Rs
                 S =  Rs 45, 000

given to trust =  0.068 * S =  Rs 3, 060

Answer 2

let the salary be m
spent on family =0.66 x m
left= m-m x 0.66=0.34 x m
trust=0.20 x 0.34m = 0.068m

left = 0.80 x 0.34m
=0.272 x m=12240
m =45000
trust amount= 0.068 x m=3060Rs