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2015-10-14T20:54:54+05:30

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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

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2015-10-14T21:08:04+05:30
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

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