Muffins by the dozen are sold for $10.00. If one muffin usually sells for $.90, what percent discount is given for the purchase of a dozen?

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The cost of buying a dozen muffins = $10.00

if one buys one muffin, he buys at = $0.90

thus for 12 muffins bought at $0.90 each = 12 x 0.90 = $10.80

thus the discount for buying a dozen muffins is = 10.80 - 10 = $0.80

Thus the percentage discount for buying a dozen muffins is;

(discount/cost of 12 muffins not bought as a dozen) x 100

(0.80/10.80) x 100 = 7.407%

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