An XBOX 360 regularly sells for $399. It is on sale for 20% off. What is the sale price of the XBOX?

To find the sale price, we need to calculate the discount amount.

Discount amount = Original price * Discount rate
Discount amount = $399 * 20/100
Discount amount = $79.80

The sale price of the Xbox is the original price minus the discount amount.

Sale price = Original price - Discount amount
Sale price = $399 - $79.80
Sale price = $319.20

Therefore, the sale price of the XBOX 360 is $319.20.