Answer:
The cost incurred by users while using Prodeff is the Processing Cost.
Step-by-step explanation:
Processing cost is the type of fee that is paid against the services of some software or machine. This is collected by the service provider or software developer.
Prodeff is the online project management software, that has the processing fee of $1 for each time of use. It will be paid by the person who use this software for the project time and cost calculation. So, $1 processing cost will be paid the user of the prodeff software.