一罐蘑菇汤售价 $3.20，3罐装的一包售价 $8。Diane 想要买 20 罐蘑菇汤。她最少需要多少钱？ 答：$ ___

1. Determine the maximum number of bundles of 3 cans that can be bought.

$20 \div 3 = 6 \text{ remainder } 2$
She can buy 6 bundles of 3 cans and 2 single cans.

2. Calculate the total cost of the bundles and the remaining single cans.

$\text{Cost of 6 bundles} = 6 \times \char36{}8 = \char36{}48$
$\text{Cost of 2 single cans} = 2 \times \char36{}3.20 = \char36{}6.40$
$\text{Total cost} = \char36{}48 + \char36{}6.40 = \char36{}54.40$