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Thank you very much and thank you for your efforts to help the community better understand Steem :)

Your are welcome :) This is a great community.

Is the interest rate on Steem power and Steem dollars the same?

No, it is not the same. Calculating interest on Steem Power is a bit more difficult - it is certainly more than 10% just because Steem is also inflating quite a bit over time. This article offers a calculator for Steem Power interest: https://steemit.com/steem/@taoteh1221/steam-power-interest-rate-calculator