Bundle is too expensive

In the new stash tab sale a single merchants tab is marked down by 20%.
Before it costed 40 now it is on sale for 30 points.

First of all, no. The item is not on discounted by 20% but 25%
30/40=0.75 = 25% off

Secondly. However, a bundle of 6 tabs is advertised with "Save 40 Points". But is costs 200 points.

200/6 = 33.333

33.333 > 30

The bundle therefore is not saving the player any money.
I think it's weird why is the bundle isn't discounted.

-Blomme :)