What is the purpose of the formulas RQI, RBI, Ra, Rs, Rb, and Rq in the context of 'Revisiones Quincenales'?


a) To calculate the total number of revisions made in a year.
b) To calculate the time interval between revisions.
c) To calculate the cost of each revision.
d) To calculate the amount of work to be done in each revision.
e) None of the above.