A Company Handles an Apartment Building with 50 Units

Multiple Choice

A company handles an apartment building with 50 units. Experience has shown that if the rent for each of the units is $370 per month, then all of the units will be filled; however, one unit will become vacant for each $10 increase in the monthly rate. If x represents the number of $10 increases, express the revenue R from the building as a function of x. ​

A) ​R(x) = 370+10x
B) R(x) = (370+10x) (50-x)
C) R(x) = 50(370+10x)
D) R(x) = 10(370-10x) (50-x)
E) R(x) = 50(370-10x)