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I know that

"I charge $100 per hour" is correct. or per day...


How about if my unit is based on 45 minutes, can I still use per?

Is it okay to say "I charge $100 per 45 minutes"?

But it sounds strange....

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kenny1999Is it okay to say "I charge $100 per 45 minutes"? But it sounds strange....

I agree that it's too strange. I would not say that.

Suppose you're talking about giving a lesson. Let's say you teach people how to play the clarinet. Say

I charge $100 a lesson, and the lesson lasts 45 minutes.

Or

I charge $100 for a 45-minute lesson.

I don't see a need for 'per' in either case.

(Of course you'll have to adjust according to what you do during that 45 minutes.)

CJ

Comments  
kenny1999Is it okay to say "I charge $100 per 45 minutes"?

Yes, but "per" is generally understood to denote a rate. In other words, the person is expected to know his 45 times tables and do modulo 60 arithmetic.

kenny1999But it sounds strange....

A bit, yes. Use "for", or make it $133.33 per hour.

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 CalifJim's reply was promoted to an answer.

How about "I charge $100 every 45 minutes"? Is it correct?

kenny1999

How about "I charge $100 every 45 minutes"? Is it correct?

It is correct.

But be aware that being correct is only the first step.

It's got to make sense, and it's got to be natural, i.e., something that a native speaker might say.

Your sentence makes sense, but it's slightly unnatural. I don't often hear English speakers saying things like that.

CJ

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Then how to better tell people the rate you charge when 45-minute is our unit? i.e. nobody in our business charges per hour, we always do 45-minute, 90-minute, 135-minute.... like this

kenny1999nobody in our business charges per hour, we always do 45-minute, 90-minute, 135-minute

Ah, well, in that case, we have to make an exception and express rates as "so much per 45 minutes".

CJ