86.54625 rounded to the tenths place is?

In order to round a number in the tenths place,, we must first look at the first number behind the decimal. If the first number behind the decimal is smaller than 5,, then you need to round down but if it is 5 or larger then you need to round up. When you look at the number 86.54625,, you can see that you need to round up to make your final answer 86.6. 
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The answer to your question is b