I’ve been trying the demo on your site out and all seems to work perfectly apart from one thing. Our customer charges £9.99 for the first item and then £1.00 each item thereafter.

This pricing procedure works correctly in principle (the base price is applied and after that £1 is added to each additional item) but it keeps rounding the £9.99 to £10. Although this is only a penny (£0.01) they want it as £9.99 and not £10.00.

Here you can see the admin area: http://goo.gl/e10sRU

Here you can see the cart which has rounded the £9.99 up to £10 and added the £1 making £11 instead of £10.99: http://goo.gl/Ol91nV

How would I do this?