Answer:
The answer is: Depends on what is considered entertainment, it can vary from $0 to $300.
Step-by-step explanation:
You can deduct ordinary and necessary expenses from your business income.
Ordinary expenses are expenses commonly paid by other taxpayers in your same industry.
Necessary expenses considers things that you need to pay in order to do business.
Some expenses can only be deducted partially even if they are ordinary and necessary, like having meals with your clients. If Olga took the clients to dinner she can deduct up to 50% of what she paid for the meal ($600 x 50% = $300)
With the introduction of the 2017 Tax Reform Law entertainment expenses (e.g. theater tickets) are no longer deductible expenses. So if Olga took her clients to a concert, then she can't deduct any amount of money.