One year of interest percentage = interest / principal (x100)
Looking at the next few years' numbers shows nonsense. Interest percentage value is changing yearly.
Oddly, the admin fee changes slightly every year. So does the total payment amount. This must be some sort of new math.
1252.40 / 30318.37 = 4.13083%
1234.64/29780.71 = 4.14577%
1216.28/29225.45 = 4.16172%
1195.63/28650.99 = 4.17308%
and in 2031... 1010.5 / 23968.9 = 4.2158%
and in 2049... 113.34 / 3429.17 3.30517%
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