You have the choice of buying your laundry detergent as: 81 pods for $18.99, 72 pods for $17.99, 42 pods for $11.99, and 50 pods for $12.99. What is the best buy?
a
50 pods for $12.99
b
42 pods for $11.99
c
72 pods for $17.99
d
81 pods for $18.99