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OpenStudy (anonymous):
A 30-day supply of vitamins costs $2.91, what is the price in cents per day? The vitamins cost cents per day
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OpenStudy (acxbox22):
divide cost by number of days since we are finding cents per day
OpenStudy (texaschic101):
30/291 = 1/x --- (30 days supply to 291 cents = 1 day supply to x cents) this is a proportion, so we cross multiply 30x = 291 x = 291/30 x = ??....you can do the math
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