Effie is selling candles to raise money for new soccer league equipment. A small candle sells for $8 and a large candle sells for $12. The number of large candles Effie sells must be greater than or equal to 2 times the number of small candles she sells. She has at most 48 candles to sell. The number of small candles sold is represented by x and the number of large candles sold is represented by y. What is the maximum revenue she can make?