Hello Dear,

As per the previous year stats, you can expect that with 41 percentile your score will be around 70-80. There is no certain rule to calculate marks for a percentile as it changes every year in MHT CET the percentile score is calculated based on the relative performance of the candidates who appeared for the entrance test. As this depends upon few factors like number of candidates appear for exam, topper's score etc.

You can check the link below to know about the procedure to calculate marks

https://engineering.careers360.com/articles/mht-cet-result

Also, check the link below to know about your best admission possibilities as per your rank in MHT CET

Good Luck