Sorry but I am quite sure there are no problem for these cases which have been discussed in previous posts. Notice tat the PHP kata was passed by 393 people out of a total of 10397. Cheers!

Had to change my function beacase of two tests. This:
"final result of System B, when rounded up to the next dollar, will be cheaper than System A."
does not seem to be true. I had to include equal in the condtition, so this:
"final result of System B, when rounded up to the next dollar, will be the same or less than System A."
should be probably in the description.

This is a great example of how not to use real world examples. Reminds me of a joke: Teaches asks, what would I have if I had 4 apples in my left hand and 6 apples in the right hand? Kids: really big hands. Seriously, who writes and accepts these? I see the programming logic you meant, but just write it without the story. It doesnt make sense.

What real-world evaporator decreases its performance based on current volume of liquid? It does not make sense. In the instructions, the evaporator stops working under 5% of initial volume. Meaning that on the 28th day it would use sth like 0,06 ml compared to the 1 ml at the beginning, meaning its performance dropped about 1600%.

Just, stop with this please. Seriously.

Thank you. I finally know what I am supposed to code.

Thank you.