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A's income is 20% less than that of B. B...

A's income is 20% less than that of B. By what percentage B's income is more than A.

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Let `B` income is `x` rupees.
Then, income of `A = x**(100-20)/100 = 4/5x` Rs
Difference in `A` and `B` income ` = x - 4/5x = x/5` Rs
Therefore, `%` of income of `B` more than that of `A = (x/5)/(4/5x)**100 = 1/4**100 = 25%.`
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