Merchants C and D sell the same article at $69.95 and $64.95, respectively. They both advertise that

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Merchants C and D sell the same article at $69.95 and $64.95, respectively. They both advertise that they will match the price offered by any other store on any product that they stock.
a. What discount rate must C give to match D’s price marked down by 20% during a sale?
b. What discount rate must D give to match C’s price marked down by 20% during a sale?
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