It is possible to round fractional total amounts to closest integer amounts automatically as downward or upward.

Manage > Tickets > Calculation Types > in here select Round template.

Template Name: Round
Account Transaction Type: Rounding Transaction
Calculation Method: Round Ticket Amount Exactly
Rate or Amount: Fraction amount which desired to be rounded. (For Example 0,250)
Max Amount: 0
Rounding: 0
Tax Included: Selected
Decrease Amount: Selected
Use Plain Sum: Unselected
Toggle Calculation: Selected