dabiralove wrote:

1. Please solve these questions.

The cost C of manufacturing a certain product can be estimated by the formula C = 0.03rst^2, where r and s are the amounts, in pounds, of the two major ingredients and t is the production time, in hour. If r is increased by 50%, s is increased by 20%, and t is decreased by 3.0%, by approximately what percent will the estimated cost of manufacturing the product change?

C = 0.03rst^2

C1 = 0.03r (1.5)s(1.2)t (1-0.03)^2 = 0.051rst^2

%change = {(0.051rst^2)/(0.03rst^2)} - 1 = 70%

_________________

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GT