You are expecting a tax refund of $4,000 in 10 weeks. A tax preparer offers you an "interest-free" loan of $4,000 for a fee of $50 to be repaid by your refund check when it arrives in 10 weeks. Thinking of the fee as interest, what weekly simple interest rate would you be paying on this loan (as a percent)? What is the corresponding annual rate (as a percent)? weekly simple interest rate  annual simple interest rate

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