Converting octal to decimal with an 8 in the question

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I was given (2228)8 to convert into decimal, I came up with:

(2)8³ + (2)8² + (2)8¹ + (8)8⁰

However i know 8 and 9 aren't used in octal so im left not really knowing what to do. Any help would be appreciated on how to solve a problem like this