1. Edit accommodation.
2. Choose the Price list tab.
3. Find the Round selling price label in the Basic Services field.
4. Change the way you wish to round the price in the first drop down list:

Disable rounding – no rounding at all
To higher – selling prices will get rounded to the higher number you choose
To lower – selling prices will get rounded to the lower number you choose
To closer – selling prices will get rounded to the closer number you choose

5.  Change the number to which you want to round:

Whole number – selling prices will be rounded to the nearest whole number matching your criteria
1 – 9 – selling prices will be rounded to the number you choose

6. Click Round button to round prices.
7. Click OK to save changes.

A table showing some rounding examples:

Example number: 45.56