Part B

Assume that Mrs. Betty's total taxes payable for 2019 is $24,000. She estimates that in 2020, her business will take off and her tax liability will be $42,000. In 2018, Mrs. Betty paid income taxes of $15,000.

What are Mrs. Betty's minimum 2020 tax instalments and when are they due? Show all calculations used to determine all possible alternatives to calculate instalment payments and explain why you chose the method you did.