Answer :
The total-A+F, then whatever is left/6, because the total minus the invoice and weekend fee would leave only the hourly rate and so with 6 hours of work you divide by 6 for R
A = weekend fee (for 6 hours of work)
F = flat fee for work done on weekend
R = hourly rate on weekend
A = 6R + F
solve for R
* subtract F from both sides, then divide through by 6
R = (A - F)/6
F = flat fee for work done on weekend
R = hourly rate on weekend
A = 6R + F
solve for R
* subtract F from both sides, then divide through by 6
R = (A - F)/6