Answer:
1.5
Explanation:
the first step is to find the unit rate for both stores A and C by dividing the cost by the number of cans for both A = 0.69 and C = 0.615, multiple 0.69 by 20 and also multiple 0.615 by 20 which is 13.8 and 12.3 then subtract 13.8 by 12.3 and u get 1.5