If an organization were to sell n tickets for a
theater production, the total revenue from ticket
sales would be 20 percent greater than the total
costs of the production. If the organization
actually sold all but 5 percent of the n tickets, the
total revenue from ticket sales was what percent
greater than the total costs of the production?

(A) 4%
(B) 10%
(C) 14%
(D) 15%
(E) 18%

OA C

Can someone please explain how we can apprach this problem by picking a number for N?

Thanks.