Zena saves $5 for every $30 she earns. Which of these describes the rate at which Zena saves? A $1 saved for every $5 earned
B. $1 saved for every $6 earned
C. $6 saved for every $5 earned
D. $0.60 saved for every $10 earned

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Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way