"accepting a native Array method is not working"
Failed on 5th test

Why do you think is it necessary?

The variable 'money' is needed for this kata. If you can resolve it without this variable, you are welcome

done

As stated in task details: 'There is always enough money to accept any offer'.
The variable 'money' is therefore not relevant to solution at all and should be removed. It is excessive - this task is solvable without ever using it.

I'm not a native speaker but: 'If I get profit and should accept all offers', feels off.
I think it should be something like 'If I get profit after accepting all offers'.

1. fixed, thanks
2. write an algorithm that tells me whether it is profitable for me to accept all the offers - it means you should always accept all offers and return the right answer: If I get profit and should accept all offers, let algorithm return 'A good day, the profit is n$.' and otherwise 'Nonprofit day.'

Description is vague.

1. "'A good day, the profit is 7500$.' because we had 1 700 000$ at the beginning and we got 1,750,500$ at the end." - doesn't it mean that a profit is 750500 and not 7500?
2. It's not clear whenever I should accept all deals or only those that fit myRate variable.

Lines strictly less than 80 columns wide are strongly preferred.