Hello,
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. So you there is no certain marks for a percentile as it changes every year.
But judging from previous year stats, you can expect that with 40 percentile your score will be around 70-80.
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
MHT CET College Predictor - Know your college admission chances based ...
Hope it helps!
Good luck!
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