In the rent formula r = RV * I (1 + I) ^ n / (1 + I) ^ (n-1), RV (principal) = 10000, n = 12 months, r = 1200

The formula should be r = RV * I (1 + I) ^ n / [(1 + I) ^ n-1]
1200=10000*I*(1+I)^12/[(1+I)^12-1]
The monthly interest rate is I = 6.1104%

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