Charley spends all of his income on soft drinks and pizza. suppose he is currently buying these products in amounts such that his marginal benefit from an additional soft drink is $ 70 and his marginal benefit from an additional slice of pizza is $ 90.

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step-by-step explanation:

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this is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

plug in the 3.20 and the 16 to solve for the "k". this is the constant of proportionality. it is the value that will not change.

3.20 = k(16). solving you get $.20 per text.

the equation would then be y = .20x