Invoice rounding after tax - round to .x0 or .x5 possible?

Invoice rounding after tax - round to .x0 or .x5 possible?

Hi there,
Is it possible to round the calculated amount on the invoices to steps of .05, .10, .15, .20, .25, etc?
Example:
Amount = 102.25
Tax = 8.2%
Amount = 102.25 * 1.082 = 110.6345

Amount to be shown on the invoice = 110.65

Can that be done?

Problem is that in my country, the smallest coin of the currency (Swiss Francs) is 5 Rappen. 1 Swiss Franc has 100 Rappen. So all amounts are rounded to a multiple of 5 Rappen.

Thanks
Dan