Air Canada airlines run daily flights from Montreal to Toronto. There are 135 economy cabin seats available. The following classes with their respective fare and demand levels are determined by the airline.

Class	Mean Forecast Demand	Standard Deviation	Fare
Y	25	5	$600
B	36	6	$475
M	49	7	$265
Q	49	3	$130

Determine the number seats to be allocated for each class that will maximize the revenue.