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A sale on dog food that cost $10 a bag says buy 1, get one 1/2 off. What is the true percent discount on the dog food?

Answer :

cost to buy one  = $ 10
Cost to buy two without discount = $ 20 
Cost to buy two with the discount = 10 + (1/2 *10) = 15

True percent discount on the dog food  = 5/20 x 100 % = 25 %

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