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A dolphin's hearts beats 688 times in 6 minutes. Answer: about 100 times
2 answers:
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$21.00
let the original price = 100%
then the discount price = 100 - 15 = 85%
divide $17.85 by 85 to obtain 1% then multiply by 100 to obtain original price.
original price = $17.85 × = $21