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    MHB Compound Interest Problem: When Will Mr. Weasley's Liabilities Be Cancelled?

    Can anyone help me with this problem? I'm stuck When will a payment of 300,000 galleons cancel Mr. Weasley’s liabilities to Gringott’s Bank of 100,000 galleons due after 2 years and 150,000 galleons due after 5 years if money is worth at an effective rate of 12%?