here you need to read present turnover limit as 2 crores as per it's last p/l account..However limit of 20 cores is given for future limit if companies act want to increase for small company from present limit of 2 crores to 20 crores in future.
The provision just says that turnover limit is 2 cr but Central Govt. may increase it in future. However, it bars CG from increasing it beyond 20 Cr. This T/O is to be taken from last P&L A/c.