Nancy was reviewing the water bill for her dog day care and spa and determined that her highest bill,$4100,occurred in May when she washed 400 dogs and her lowest bill,$2700,occurred in November when she washed 250 dogs.What was the variable cost per dog associated with Nancy's water bill?

Question

Quizplus · Accepted Answer

The variable cost per dog is the difference between the highest and lowest bills divided by the difference in the number of dogs washed. In this case, the variable cost per dog is ($4100 - $2700) / (400 - 250) = $1400 / 150 = $9.33.

Nancy Was Reviewing the Water Bill for Her Dog Day