Acandy store makes a 13–pound mixture of gummy bears, jelly beans, and gobstoppers. the cost of gummy bears is $1.00 per pound, jelly beans cost $2.00 per pound, and gobstoppers cost $2.00 per pound. the mixture calls for three times as many gummy bears as jelly beans. the total cost of the mixture is $20.00. how much of each ingredient did the store use?

8 lbs gummy bears, 2 lbs jelly beans, 3 lbs gobstoppers
3 lbs gummy bears, 6 lbs jelly beans, 4 lbs gobstoppers
6 lbs gummy bears, 2 lbs jelly beans, 5 lbs gobstoppers
8 lbs gummy bears, 3 lbs jelly beans, 2 lbs gobstoppers