Suppose she earned x /month and save 1/n fraction
Monthly saving = x/n
Monthly expense = x-(x/n) = x(n-1)/n
Yealry saving = 12x/n
As per the q = 12x/n = 3*x*(n-1)/n
Solve to get n = 5
So she save 1/5th fraction of mnthly pay
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