Alocal grocery store makes a 9-pounds mixture of trail mix. the trail mix contains raisins,
sunflower seeds, and chocolate-covered peanuts. the raisins cost $2 per pound, the
sunflower seeds cost $1 per pound, and the chocolate-covered peanuts cost $1.50 per
pound. the mixture calls for twice as many raisins as sunflower seeds. the total cost of the
mixture is $14.50. how much of each ingredient did the store use?