a person allows a discount of 20% on already discounted M.P. what is the initial discount given if he totally gains 20% and M.P is double the C.P ?

Dear student
Let the cost price =100xThen MP=200xLet the initial discount be y%After discount , let MP be zDiscount of 20% is given on zSelling price=120x80% of z=120xz=120x80%z=120x×10080=150xInitial  discount=200x-150x=50xDiscount %=50200×100=25%
Regards

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