Olivia earns $8.50 per hour for babysitting her brother. She also earns a weekly bonus of $12 if she helps with Last week, Olivia helped with the laundry and earned a total of $139.50 for h hours of babysitting. Based on this situation,
which statement is true?
A. Olivia babysat for a total of 20.5 hours.
B. Olivia babysat for a total of 15 hours.
C. Olivia babysat for a total of 7 hours.
D. Olivia babysat for a total of 8.5 hours.

Olivia babysat for a total of 15 hours.

Step-by-step explanation:

8.50(h) + 12 = 139.50

In order to get a direct result of the hours she

worked, we have to subtract 12 on both sides:

8.50(h) + 12 - 12 = 139.50 - 12

In order to fine the value of time she spent, we have to divide the amount of money she got on both sides:

8.50(h) = 127.5

 8.50   =  8.50

    h     =     15

Therefore, Olivia babysat for a total of 15 hours.

sup

step-by-step explanation: