Loss div by cp * 100
25% discount
you have written loss.. actually it is not given in the question that it is a loss. it can be discount or it can be some other thing.. please note...
sorry if i hurt you by saying the above ..
thanks sir i have no problem

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Decrease = Rs 80 - Rs 60 = Rs 20
Percentage decrease = (Decreased amount / Original amount) *  100
           = 20 / 80  * 100  = 25 %
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