Error with tax its adding extra 1p onto everything

[daidap]

Hi  Guys

i have a Error with tax its adding extra 1p onto everything for example

2 x tshirts  £20 each
=£40

but its coming out at £40.01       the tax is £6.67 but it should be £6.66

can someone tell me how to do this in the backend of my site

[AH]

Have you go show rounding in display only checked - if so uncheck it

[Milbo]

ehrm, round 6.6666666 to two digits => 6.67