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Fred and Melissa make regular deposits to a savings account. They both deposited $100 when they opened their accounts. Each year, they both decided to add $100 to their accounts. Fred’s account earns simple interest at a rate of 7%. Melissa‘s account earns simple interest at a rate of 4%.
After 5 years, how much more interest has Fred's account earned than Melissa’s account? Give your answer in WHOLE dollars.