Thank you Nicolas,
I upgraded to 2.5.0 and now format of all prices are OK, but still there is a problem with calculating Price with option value. It takes decimal numbers only from 1st option prices, but without decimals from 2nd, 3th and 4th options.
What I noticed on Debuger window is that price array is created with mixed formats of prices (with dot or comma) i.e.:
var hikashop_options=Array();
hikashop_options[285]=121.77;
hikashop_options[286]=244.77;
hikashop_options[29]=207,87;
hikashop_options[30]=158,67;
hikashop_options[32]=343,17;
hikashop_options[34]=207,87;
hikashop_options[35]=158,67;
hikashop_options[36]=343,17;
hikashop_options[294]=183,27;
hikashop_options[3]=737,47323340471;
hikashop_options[2]=675,27;
And this probably reason of wrong Price with options calculations.
Best regards
Jacek