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formula for calculating the net percentage change is a +b +ab/100 where a and b are percentage change,

Here as there is a discount so we will take b as negative

by using permutation we can observe taking a = 25 and b = - 20 we get 0

25-20+(25x-20)/100 = 5-5 => 0

punwani7
Bunuel Can you help me out with a different approach for this?
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