#### Explanation:

Assuming she works seven days per week, the number of hours worked per week is given by the number of hours worked per day multiplied by the number of days worked per week

$\text{Hours worked per week"=2.5*7=17.5 " hours}$

The hourly rate of pay is then given by the total weekly pay divided by the number of hours worked per week

$\text{pay rate per hour"="total weekly pay"/"number of hours worked per week"=84/17.5=$4.8 " per hour}\$