Martha quoted her client $850.00 for an upcoming project, Martha wants to invoice her client periodically through five stages of the project---totalling to $850 when the project is complete. If Martha is charging an hourly rate of $20 for her services, how would she write her work hours and invoice total that would equal to the $850 she estimated?

Remember, she is invoicing her client through five stages, which means that each invoice price must be consistent to exactly match $850.