The Sanders Garden Shop mixes two types of grass seed into a blend. Each type of grass has been rated (per pound) according to its shade tolerance, ability to stand up to traffic, and drought resistance, as shown in the table. Type A seed costs $1 and Type B seed costs $2. If the blend needs to score at least 300 points for shade tolerance, 400 points for traffic resistance, and 750 points for drought resistance.

	Type A	Type B
Shade Tolerance	1	1
Traffic Resistance	2	1
Draught Resistance	2	5

a) How many pounds of each seed should be in the blend?

b) How much will the blend cost?