What does this mean?

Oops. I did originally mark as spoiler but then it unchecked when I edited.

I did wonder though, given that this is in the solutions section, wouldn't it only be seen by people who have already solved/given up?

I'm finding some confusion about trailing spaces. When attempting the tests, if I don't remove trailing spaces I get

random

expected:<apples, pears[
grapes
bananas]> but was:<apples, pears[ 
grapes
bananas ]>

If I trim white spaces

edges

expected:<a
[ ]b
c> but was:<a
[]b
c>

Very efficient solution!

This is really nice code. Just one question...for the seconds, why is it necessary to do (seconds%3600)%60? Surely seconds%60 would be sufficient?

Extra marks for squeezing all the air out of this code

What are the first two lines doing here? It seems like the customers <--> prospects join is just done on the prospect name containing both the first name and last name so I don't see what you're doing with the first two lines?

Would someone be able to explain how this works? I don't see how this accounts for [1,[1,1]] not same as [2,[2]]. Only seems to be checking if each part of the array is in itself an array, doesn't look at size?

New to python...I'm getting the right answer but there is a gap between each digit i.e. 1 1 0 1 where it should be 1101. I'm using print(). How do I remove the blanks?

This seems to be the highest rated solution which actually passes the requirements laid out in the question (due to the tests not being stringent enough). I also really like how elegantly simple this solution is. I wrote something which works but is much more complicated.

I passed but in the output of the sample tests I can't actually see the number of years. I was expecting to be able to see my results (java)

The tax is a percentage OF the interest