Total number of people = 4 (Janice, Stephanie, Rose, and Gina).
Total amount to be paid for all 4 people = $ 84.70.
Janice, Stephanie and Gina worked = 5 hours each.
Total number of hours worked by Janice, Stephanie and Gina = 5*3 = 15 hours.
Rose worked 45 minutes less, that is 5 hours - 45 minutes = 4 hours 15 minutes = 4.25 hours.
Total number of hours worked by all = 15+4.25 = 19.25 hours.
Therefore, for total 19.25 hours of work total amount paid = $ 84.70.
Let us find rate per hour.
Rate per hour = 84.70/19.25 = $ 4.40.
Janice, Stephanie and Gina each paid = 5 × 4.40 = $22.00.
And Rose get paid = 4.25 × 4.40 = $18.70.