The commission is usually between 10%-20% for large medical devices. There are also a lot of small consumable items (which rely on the volume of profit) that have a very low commission, and there are even those that have a commission of less than 1%. The key is how many orders you can make, and how much money you can get at the end of the day according to the single commission ratio.
Doing sales is very hard, you have to be mentally prepared. In the line of general just started 1 year is not earn any money. After the road away, it is much easier.