Discount, pricing and taxes

[Franklin]

I'm running VM 2.0.20b and have published a product in it. The cost price is € 49,55 (price without 21% VAT). With 21% VAT included, the final price becomes € 59,95. SO FAR SO GOOD...
I have added a discount of € 29,97 and set the override function to "Overwrite final". The selling (final) price is shown correct in the frontend... but: the original cost-price is shown without 21% VAT included.

Ik heb in VM 2.0.20b een artikel aangemaakt en hier de "Kostprijs" (lees: zonder 21% BTW) ingevoerd en de standaard rekenregel +21% BTW overheen gezet. So far so good, VM berekent de uiteindelijke verkoopprijs bij het opslaan.

Current situation:

Normally: € 49,55
Now: € 29,98
Your discount: € 29,97

But this is what I want it to display (all prices with VAT included)):

Normally: € 59,95
Now: € 29,98
Your discount: € 29,97

Summarized in one line: How can I show the original cost price with VAT included?

Any help is appreciated.