PLEASE EXPLAIN WITH FORMULAS, TRYING TO LEARN THE CONCEPTS. THANK YOU.

The Massage Place charges $66 for a 60-minute massage. The cost of providing a 60-minute massage is $22. The marketing director has determined that the average client gets a massage once every three months, and she is analyzing the profitability of a membership plan where members receive a discount on massages. The annual membership fee would be $50 and would entitle the member to 1 60-minute massage each month for $47. What additional is the additional value generated by the membership plan per client if an average client books a massage every month under the plan? Assume a three-year time horizon. IBC Currency (US)