Bananas are on sale for $0.40 a pound, and you have a coupon for $0.25 off your total purchase. write a function rule for the cost of n pounds. how much would 30 pounds of bananas cost?
a) c(n)= 0.25n-0.40; $7.10 b) c(n)= 0.4n-0.40; $11.60 c) c(n)= 0.4n-0.25; $11.75 d) c(n)= 0.4n; $12.00

Answer

Write a function rule for the cost of n pounds and Find how much would 30 pounds of bananas cost .

To prove

First Case

First find the function rule for the cost of n pounds.

As given

Bananas are on sale for $0.40 a pound, and you have a coupon for $0.25 off your total purchase.

Here number of bananas = n pounds

Than the function becomes

C(n) =  0.4n - 0.25

Where C(n) is represented the total cost of the n pounds bananas.

Second Case

Find the cost for the 30 bananas .

Put n = 30 in the above equation.

C(30) =  0.4 × 30 - 0.25

          = $11.75

Therefore the option (C) is correct.

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