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%
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revenue for n tickets = 1.2*(total costs of production), take total costs = c
asking what is the revenue for 0.95n tickets ?
I reasoned it as: for n tickets-> 1.2c, then for 0.95n tickets-> what c? taking the cross-multiplication we get = 1.2*0.95 = 1.14c, it means revenue is 14% greater than production costs.

Simple ratio problem here.

100/120 = 95/x. x = 114, or 14% greater than cost.

If we let c = the total cost of production, then 1.2c = the revenue from selling n tickets. Another way of saying this is that selling n tickets results in 1.2c. But we want to determine the total revenue from selling 95% of the tickets, or 0.95n. If we let x = the total revenue from selling 95% of the tickets, we can create the proportion:

n/1.2c = 0.95n/x

nx = (1.2c)(0.95n)

nx = 1.14nc

x = 1.14c

The total revenue from selling 95% of the tickets is 1.14c, which means that the total revenue is 14% greater than the cost of production.

Answer: C
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