The health food store wishes to blend peanuts that cost $1.20/lb with raisins that cost $2.10/lb to make 50 pounds of a mixture that costs $1.47/lb. How many pounds of peanuts and of raisins are needed?
a) Peanuts: 30 lbs, Raisins: 20 lbs
b) Peanuts: 20 lbs, Raisins: 30 lbs
c) Peanuts: 25 lbs, Raisins: 25 lbs
d) Peanuts: 35 lbs, Raisins: 15 lbs