The 3 pack cost $9.45
3 single cartons would have cost: 3 x 4.20 = $12.60
Difference in cost: 12.60 - 9.45 = $3.15
Percent savings : 3.15/ 9.45 = 0.3333
0.333 x 109 = 33.33%
Round the answer as needed
Answer: 0.11429 (Rounded to fifth decimal place)
Y - y1 = m(x-x1)
y - 7 = -3/2(x + 6)
