Question about order quality dropdown menu

Some of our products come in with number of units in a package and we would like to create a drop down menu of the total unit ordered not total package.  Is there a way to set up dropdown menu with a multiplier when someone placed an order?  

Example for order that come in a package of 50,  in the quality drop down menu there will be choice of  50, 100, 150, 200, or 250 and but it will send an order 1, 2, 3, 4, or 5 to the system inventory if you know what I mean?  

If someone select 200 which is 4 packages of 50 then it send 4 to the system inventory to ship out 4 packages instead of 200 package.

Can it be set up this way with a drop down menu?

Thank you
Bill

TechBill wrote:
When creating/editing a product, you have a setting allowed quantities which you could set to 1 to 5, but you have to specify that your product is a package of 50, and for that you can use the PAngV (base price) setting.

I looked at the PAngV as you suggested but it seem to be measured in weight not per unit.

Did I overlooked another setting somewhere?

Thank you
Bill

TechBill wrote:
Maybe the PAngV was not a wise suggestion. I thought you can specify by liters, wight, and maybe units.
Then you should make clear that you are selling by packages of 50.