Interest rate calculation

When buying a house with an equal-amount principal loan, the monthly repayment calculation formula is:

Monthly repayment = monthly principal per Monthly principal and interest

Monthly principal = principal/number of repayment months

Monthly principal and interest = (principal - total cumulative repayment) X monthly interest rate

Equal principal interest rate calculation principle: The principal amount returned every month remains unchanged, and the interest will decrease as the remaining principal decreases.