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How to calculate the initial and final repayment amount under the method of equal principal and interest repayment?
Equal principal and interest method:

Number of loan months

Total interest = principal × monthly interest rate ×( 1+ monthly interest rate)

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Number of loan months

(1+ monthly interest rate)-1

Law of average capital:

Current monthly repayment amount = (principal-monthly principal × current month) × monthly interest rate+monthly principal.

(interest calculation formula for you)