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Mathematics, 27.01.2020 21:31 tahmidtaj150

Last month, raul bought 6 used books for $7.50. this month he bought 8 used books for $10.00. what is the constant of proportionality between the cost and the number of books bought?

a. 0.75
b. 1.25
c. 2
d. 2.5

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