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Question:

Cards normally sell for $3.00 each. How much was saved if five cards were purchased on sale for two for $5.00?

A $2.50
explanation

Five cards at $3.00 each cost 5 × $3.00 = $15.00. If cards are two for $5.00, the cost per card is $5.00/2=$2.50, so five cards would cost $2.50 × 5 = $12.50. The amount saved is $15.00 – $12.50 = $2.50.