The marketing manager also wants to know how much sales will increase if she increases the advertising budget by 10%. Compute this from the information given.
Calculate ∆QXd/∆AX -
∆QXd/∆AX = d(QXd)/dAX = d(20000 - 10PX + 7PY + 0.5M + 250AX)/dAX = 250
Calculate advertising elasticity of demand -
eA = (∆QXd/∆AX) * (AX/QXd)
eA = 250 * (250/45030) = 1.388
The advertising elasticity of demand is 1.388.
Calculate percentage change in sales =
Percentage change in sales = Advertising elasticity of demand * percentage increase in advertising budget
Percentage change in sales = 1.388 * 10 = 13.88
The sales will increase by 13.88 percent.
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