Insert commas suitably and write the names according to International System of Numeration :

$99985102$

Insert commas suitably and write the names according to International System of Numeration :

$48049831$

A book exhibition was held for four days in a school. The number of tickets sold at the counter on the first, second, third and final day was respectively$1094, 1812, 2050$ and $2751$. Find the total number of tickets sold on all the four days.

Find the difference between the greatest and the least number that can be written using the digits $6, 2, 7, 4, 3$ each only once.