A new cell phone has a purchase price of $225. With the extended warranty, the total cost comes to $289. What percent of the purchase price is the price of the warranty?

The warranty costs $289 − $225 = $64. As a percentage of the $225 purchase price, that is ($64 ÷ $225) × 100 ≈ 28.4%, which rounds to 28%. The correct choice is 28%.

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