Compufy Inc. sells refurbished laptops online. A particular model, sold at $400 at the beginning of the year, was reduced in price by $80 at the end of the first year. At the end of the second year, the price was increased by $64. Calculate the percent change in the price of this model at the end of each year from its price at the beginning of each year. If a sale was made at the end of the second year, calculate the discount rate offered from the original price of $400.

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