Can anyone walk me through how to do challenge 9 correctly?

[Arokthis]

Either it hangs on a low percentage without going anywhere, or I get an infinity and it doesn't count.

What am I doing wrong?

[Ano]

you buy manually
1st dim 10
2st dim 10
3st dim 10
4st dim 20
Dimension boost
1st dim 10
2st dim 10
3st dim 10
4st dim 10
5st dim 20
Dimension boost
1st dim 10
2st dim 10
3st dim 10
4st dim 10
5st dim 10
6st dim 20
Dimension boost
1st dim 10
2st dim 10
***
7st dim 20
Dimension boost
1st dim 10
***
8st dim max
Dimension boost

You start looking at the Cost of things:
After this you buy 8 first then a bit less 7 a bit less 6 a bit less 5 a bit less 4 a bit less 3 a bit less 2 a bit less 1 a bit less ticketspeed and start over with 8dim again over dimboost and galaxy wenn you can.

if it does not count you don t have it active and why it just does not rise high enough is cause you go most likely auto and lock yourself in.