Vendor pricing based on quantity of 100 or 1000

Hi,

We have vendors which are are issuing price lists based on a quantity 100 or 1000.

Base, sales and purchase UOM is MTR.

For example: The vendor price is $ 30.65 for 1000 MTR

The purchase order is for 1250 MTR with no specific packing size

If you divide $ 30.65 by 1000 you get a MTR price of $ 0.03065 per MTR which gives you 

5 digits after the comma. Since the unit price has only 4 digits after the comma you can  

only enter $ 0.0306 or $ 0.0307.

It would ideal to have a vendor price worksheet were you could specify prices per 100 or 

per 1000. Would be interesting to hear if anybody has a solution for this problem.