It would take Lisa 3 hours to finish the painting since both Brennan and Lisa could end up charging the same amount of $84.
Flat rate quoted by Brennan = $84
Rate quoted by Lisa = $8 h + $60
The number of hours for Lisa to finish the painting = 3 hours ($84 - $60)/$8
The total cost that Lisa would charge is $84 ($8 x 3 + $60).
Thus, it would take Lisa 3 hours to finish the painting since both Brennan and Lisa could end up charging the same amount of $84.
Learn more about estimating quotations for a job here: https://brainly.com/question/794250