Answer:
Chris's total earning will be: $306.25
Explanation:
Given:
Total number of dogs = d = 5
Number of weeks = w = 7
Cost for walking per dog = c = $8.75
First of all, we will calculate his per week cost of walking 5 dogs
Per week cost of walking 5 dogs = d*c = 8.75*5 = $43.75
Then for the cost of 7 weeks, the amount of one week will be multiplied by 7
Total earning will be:

Hence,
Chris's total earning will be: $306.25