What is the best deal?
• 1 lb of flour at $0.85
• 2 lb of flour at $1.65
• 2.5 lb of flour at $2.00
• 5 lb of flour at $4.25
• 10 lb of flour at $9.00

2.5 lb of flour at $2.00

Step-by-step explanation:

When you reduce all the options to 1 lb you get

- 1 lb of flour at $0.85

- 1 lb of flour at $0.825 (2 lb of flour at $1.65)

- 1 lb of flour at $0.8 (2.5 lb of flour at $2.00)

- 1 lb of flour at $0.85 (5 lb of flour at $4.25)

- 1 lb of flour at $0.9 (10 lb of flour at $9.00)

The best deal is 2.5 lb of flour at $2.00