Question

The Cumberland Phone Company charges a flat rate fee for the first 120 minutes of phone calls each month. After that, there is a charge of $0.06 per minute for each minute thereafter. If those calls are outside a local calling region, there is a fee of $0.13 per minute. Rosie makes 135 minutes of phone calls. Of the additional 15 minutes of overage time, she had 6 minutes outside of her local calling area, and 9 minutes inside 2 Assuming that is the overage charges and is the average minutes, the slope of the curve generated from Rosie's overage phone usage is (Enter your response rounded to two decimal places)

Answer 1

Overage minute(X) is 15min of which 6min outside local area and 9min inside it.

So Overage chagre(Y) = 6*($0.13) + 9*($0.06) = (0.78 + 0.54)

Overage Charge(Y) = $1.32

If X=0 , then Y is also 0,

So we have to find slope between two points (0,0) & (15,1.32)

Slope = (1.32-0)/(15-0) = 1.32/15 = 0.088

So, slope = 0.088

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