Compute the complement rate and the net price using the complement method.
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Complement Rate

In finance, it usually refers to the difference between 100% and the given rate of interest, used to calculate discount or markup rates.

Net Price

The final price after any discounts, rebates, or other deductions have been applied.

Complement Method

A technique used in mathematics and computer science to subtract one number from another by complementing one of the numbers and performing addition.