the cost C of printing a magazine is jointly proportional to the number of pages p in the magazine and the number of magazines printed m.  a) write an equation that expresses this joint variation. (use k for the constant of proportionality.) __________ b) find the constant of proportionality if the printing cost is $52,500 for 4000 copies of a 105-page magazine. k=________ c)how much would the printing cost be for 5000 copies of a 94-page magazine? $_________

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