navodaya Exam Numerical Ability Ratio and Proportion

Income of Avin is 5/8 of the income of Bina .Avin's expenses are one-half of those of Bina ,AND Avin saves 40% of his income .What percentage of her income does Bina save?

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25%

Let Bina's income=x, then Avin's income=(5/8)x
As Avin saves 40% of his income, so Avin's expenses are 60% of income=(60/100)*(5/8)x=(3/8)x
Thus Bina's expenses=2*Avin's expenses=2*(3/8)x=(3/4)x
Therefore Bina's savings=x - (3/4)x = (1/4)x
Hence Bina's saving in % = [(1/4)x/x]*100=25%
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