Question?

I am new here,and I am quite confused about steem power,so I checked some articles around,but still quite not get it.
I just want to know one thing,what is the annual interest rate?I found one calculator below and put in some numbers,the results frightened me,So I want some real answers.thanks
https://jscalc.io/calc/KcEkRo6qv2s8CM6S1.jpg

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