A dealer gain 20% when he sells an article by giving 10℅ discount on its list price. If c. p is

A dealer gain 20% when he sells an article by giving 10℅ discount on its list price. If c. p is decreased by 28℅ and the dealer still want to earn 25℅ profit then how much discount ℅ should the dealer offer on the same list price?
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