By default system will show zero decimal point for QTY and 2 decimal for U.PRICE. 

Example : Sales Invoice

How to change decimal point in Sales Transaction

Step 1 : Go to Maintenence --> System Option --> Change QTY PRECISION = 2 --> SAVE

2. Step 2 : go to Transaction, you can see the QTY Decimal already change to 2 decimal

Edit Invoice format to show qty = 2 decimal point

Step 1 : Go to Report Designer and select format to amend

Step 2 : select QTY field --> click arrow button

Paste this format into Format String field : {0:#,#0.00;;""}

or you can select decimal format from (...) button

Kindly click below attachment to download