There are four drinks on sale:• 20 ounce cup for $4.

This question tests unit rate comparison, which is common on the NEX exam. To find the price per ounce, divide the cost by the number of ounces for each drink. For the 20-ounce cup: $4.00 ÷ 20 = $0.20 per ounce. For the 12-ounce cup: $3.00 ÷ 12 = $0.25 per ounce. For the 10-ounce cup: $2.50 ÷ 10 = $0.25 per ounce. For the 8-ounce cup: $2.40 ÷ 8 = $0.30 per ounce. The most expensive price per ounce is $0.30, which corresponds to the 8-ounce cup. Therefore, option B is correct. The NEX frequently includes comparison problems that require calculating unit rates rather than comparing total prices. Always divide cost by quantity to ensure an accurate comparison.

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