How to calculate Corn Future price from 5-340 usd to "normal" price ??

Trading Discussion
1

Hi
On 30-sept-2021 I traded CORN future DEC 21
In my monthly statement I saw a price 5-34 usd but I need the correct (normal) price for my tax report …

How to calculate Corn Future price from 5-340 usd to “normal” ? ?

Thanks