Posted by **Rina** on Wednesday, January 9, 2013 at 11:49pm.

Find the cost of 999 kw-hr at 7.3 cents per kw-hr.

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**DrBob222**, Wednesday, January 9, 2013 at 11:57pm
999 kw-hr x 0.073/kw-hr = ?

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**Rina**, Thursday, January 10, 2013 at 12:02am
72.927 kw-hr. Am I right DrBob222? but do I have to round off 72.927 to the nearest cents?

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**DrBob222**, Thursday, January 10, 2013 at 12:16am
Yes. It rounds to $72.93.

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**Rina**, Thursday, January 10, 2013 at 12:18am
yes, that is right! Because I kept rereading my math book and i found out it says to round off to the nearest ten cents. Thank You DrBob222!

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**DrBob222**, Thursday, January 10, 2013 at 12:33am
If you are to round to the nearest 10 cents, then I would round to $72.90.

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**Rina**, Thursday, January 10, 2013 at 1:41am
Nevermind, because 9 8s bigger than 3 of course so it round down to 90 cents.

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**Steve**, Thursday, January 10, 2013 at 10:57am
No, it rounds down to 90 cents because 3 is less than 5. 93 is closer to 90 than to 100.

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