'At approximately'?

[Mehrgan]

Hi,
How should 'approximately' be used with 'peak' in the following sentence, please?

'...the oil production reached its peak at approximately 80 million barrels per day...'

 

[Mehrgan]

I think, '...reached a peak of approximately 80...' is considered a correct usage. However, I was wondering if 'at+approximately' or 'at+about' are correct or not?

 

[Rover_KE]

Both versions are fine, Mehrgan.

Rover