Premine 20%??? This screams SCAM. Stay away.. devs are so stupid and greed that cannot even count that even 2% is huge amount of money for most of the coins hat reaches at least for few satoshis..
What are you talking about 20%?
The premine is 90 million MTLC. There are only 50,000 proof-of-work blocks giving 1 coin each.
Hence total supply from proof-of-work is 90,050,000.
Run the numbers again and calculate the premine percentage.