Olave sold 108 apples at a constant rate over 6 hours. If she continues to sell apples at the same rate, how many apples will she sell in the next 1 hour and 30 minutes?
(A) 27
(B) 33
(C) 45
(D) 36
(E) 21
Since Olave sold 108 apples in 6 hours, then she sold $108 \div 6=18$ apples in one hour. A time period of 1 hour and 30 minutes is equivalent to 1.5 hours.

Therefore, Olave will sell $1.5 \times 18=27$ apples in 1 hour and 30 minutes.

ANSWER: (A)