Two stores sell cds in packages, as shown in the table below. cd prices at store a number of cds in package 1 12 20 45 cost $0.70 $8.40 ? $31.50 cd prices at store b number of cds in package 1 20 30 65 cost $0.60 ? $18.00 $39.00 if the rate at each store is constant, which statement correctly compares the cost of a package containing 20 cds? the cost at store a is $2.00 greater than at store b. the cost at store b is $2.00 greater than at store a. the cost at store a is $1.00 greater than at store b. the cost at store b is $1.00 greater than at store a.