I changed the Accounting-Configuration-Currencies' Rounding Factor to 1. This practically solves all my issues except one. In the POS System, it shows two decimal points like this:

product 1
20Units at 8.33/Units 166.00

product 2
24Units at 18.75/Units 450.00

product 3
24Units at 12.50/Units 300.00
------------------------
916.00

I'm okay with this, but after validating the payment, the receipt would round off all the unit prices and would print this:

product 1
20x8 166.00

product 2
24x19 450.00

product 3
24x13 300.00
------------------------
Total 916.00

How to show in the receipt the correct unit prices and not the round off figures.