Below are Ms. Clarke's income's for 2016 and 2017, and estimated income from 2019. Determine if Ms. Clarke is required to make installment payments, and which alternative would be preferred for each case presented.
Case A
2019 estimated 4000
2018 1000
2017 2500
Case B
2019 estimated 3000
2018 4000
2017 3500
Case C
2019 estimated 1000
2018 3000
2017 5500
Case D
2019 estimated 4000
2018 nil
2017 3500
Sample Solution