Answer: 89
Step-by-step explanation:
1 hr of mowing = 8.20 dollars
1 hr of babysitting = 7.90 dollars
7 hrs of mowing = 8.20 x 7 = 57.4 dollars earned
4 hrs of babysitting = 7.90 x 4 = 31.6 dollars earned
Total amount she has earned = 57.4 + 31.6 + = 89 dollars