The harvest nut company sells made-to-order trail mixes. santitio's favorite mix contains peanuts, raisins, and carob-coated pretzels. peanuts sell for $3.20 per pound, raisins are $2.40 per pound, and the carob-coated pretzels are $4.00 per pound. santito chooses to have twice as many pounds of pretzels as raisins, wants 5 pounds of mix and can afford $16.80. how many pounds of peanuts can santito buy?
a. 2 lb
c. 3 lb
b. 1 lb
d. 0.5 lb