SCREEN [2]

A shopkeeper gives old clothes at rate of ₹90 instead of ₹100
It can be said that on sale of ₹100 shopkeeper takes ₹10(i.e. ₹100 - ₹90) less
Dividing 100 in 100 parts we get 1 simliarly on dividing 10 in 100 parts we get 10/100
Thus for sale of ₹1 shopkeeper takes ₹10/100 less
Thus for sale of ₹100 clothes the shopkeeper takes (10/100) + (10/100) + ......(100 times)
Thus shopkeeper gives (10 / 100) * 100 = 10% discount if he sells clothes at ₹90 instead of ₹100
Thus it can be said that the shopkeeper gives 10% discount on sale of clothes of ₹100

SCREEN [3]

Similarly if the shopkeeper gives old clothes at rate of ₹32000 instead of ₹128000
It can be said that on sale of ₹128000 shopkeeper takes ₹96000(i.e. ₹128000 - ₹32000) less

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Dividing 128000 in 128000 parts we get 1 simliarly on dividing 96000 in 128000 parts we get 96000/128000
Thus for sale of ₹1 shopkeeper takes ₹ 96000/128000 less
Thus for sale of ₹128000 clothes the shopkeeper takes (96000/128000) + (96000/128000) + ......(128000 times)

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Thus shopkeeper gives (96000 / 128000) * 100 = 75% discount if he sells clothes at ₹32000 instead of ₹128000