A granola mix sells for $8.99 a pound. Tung wants to buy a bag of granola mix that weighs 7.8 pounds. The bag of granola mix will cost about

Multiply the price per pound by the bag’s weight: $8.99 × 7.8 = $70.122. That is about $70, and $72 is the closest choice. You can also estimate using $9 per pound and 8 pounds: $9 × 8 = $72.

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