Does anyone know how to calculate a mortgage with dual balloon payments?

I am looking at entering a contract for deed on a vacation property with the amount being financed of $127,000 over 120 months at 5.25% with a balloon payment at month 61 of $10,000 and paying another balloon payment for the remainder of the balance at month 121. What I am trying to determine is the monthly payment... show more I am looking at entering a contract for deed on a vacation property with the amount being financed of $127,000 over 120 months at 5.25% with a balloon payment at month 61 of $10,000 and paying another balloon payment for the remainder of the balance at month 121. What I am trying to determine is the monthly payment over the term of the contract with the two balloon payments factored into the equation.

Thanks.
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