"It is not possible to reduce price"

Translation: Haiwezekani kupunguza bei

[aboutpurpo]

Maybe everyone else understood this, but I just got why this ending is -kani rather than -kana. It's because of the negative.

[AGreatUserName]

Yep. Negative present tense changes a final "a" to "i".

kuwezekana = to be possible
inawezekana = it is possible
haiwezekani = it is not possible