after spending 80% of his income and giving 10% of remainder in a charity a man has 4900 left with him .
find his income.
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let the total income be x
so money he gives 80%of x=0.8x
money left=x-0.8x=0.2x
money he gave to charity = 10%of 0.2x=0.02x
total amount he used from his salary = x-(0.8x+0.02x)
=x-0.82x
=0.18x
money left=4900
total income =0.18x=4900
x=4900÷0.18
=27222.22
so money he gives 80%of x=0.8x
money left=x-0.8x=0.2x
money he gave to charity = 10%of 0.2x=0.02x
total amount he used from his salary = x-(0.8x+0.02x)
=x-0.82x
=0.18x
money left=4900
total income =0.18x=4900
x=4900÷0.18
=27222.22
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