Round order total

[anabrolic 0]

I tried a couple of rounding methods but they seem to work only on the default currency of the store.

For example if the total in USD is 88.87, the rounding is 0.13 for a total of 89USD. Now 88.87USD equals 68.36 euros (exchange rate 1.30) and it displays an incorrect rounding of 0.10 , the exact exchange rate of the USD rounding

 

So any ideas on how to make the rounding work for other currencies than default

Thanks