The 15 homes in a new development are each to be sold for one of three different prices so that the developer receives an average (arithmetic mean) of $200,000 per home. If 4 of the homes are to be sold for $170,000 each and 5 are to be sold for $200,000 each, what will be the selling price of each of the remaining 6 homes?
A. $200,000
B. $210,000
C. $215,000
D. $220,000
E. $230,000
Answer: D
Source: GMAT Prep