Not a issue.

Nobody mentioned that the two indices has to be coprime.

@rsdah13, have made some updates to the description, let me know if that's clearer for you! Thanks for your help

I'm sorry, you've lost me -- the first index is the number whose multiples is replaced by Fizz, the second index is the number whose multiples are replaced by Buzz. Is there some way I can make that clearer?

Read again:
1

Furthermore the percent of loss increases by a fixed 0.5 percent at the end of every two months.

2

If, for example, at the end of first month the percent of loss is 1, end of second month percent of loss is 1.5, end of third month still 1.5, end of 4th month 2 and so on ...

1 shows the "percent loss by month" cannot change at month 0: it happens at the "end" of ...

I hope it is clearer now:-) Anyway thanks for your post. One is never too precise!

The tests are the same in all languages and 1545 guys passed the kata...
It depends where you put your line about the 'Percent loss by month".
Look at other solutions.
I don't see any issue in that.