Problem calculating exact cost (with decimals)

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I am using this plugin with the following setting:

I have created a product with a weight of 0.689655 kg.
The total cost should be 40,00€.

But regardless the number of decimals I use on the product weight, I get a total on the Shipping Costs of 40,02€ which is quite…annoying for the client… :/

What might be wrong with that calculation and how could I fix it?

 

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