Can you please explain the following question? It is based on New Zealand Tax Compliance and Penalties

Brown Cows Limited has a balance date of 31 March and files GST on a 2 monthly basis. In 2019 Brown Cows Limited made a profit of $260,000 and had residual income tax of $72,800. They filed their 2019 tax return on 7 July 2019.

On 28 August 2019 Brown Cows paid P1 2020 provisional tax of $25,480.

On 15 January 2020 Brown Cows paid P2 2020

provisional tax of $26,694.

On 7 May 2020 Browns Cows paid P3 2020 provisional tax of $10,000.

Brown Cows Limited subsequently filed their 2020 tax return on 7 July. They had a profit for 2020 of $250,000 and residual income tax of $70,000.

1. Calculate the 2020 Terminal Tax due for Brown Cows Limited.

2. Assuming a use of money interest rate of 8.35% for under paid tax, calculate (if any) the interest charge to Brown Cows Limited if they pay their 2020 terminal tax on 7 April 2021. Show your workings.

3. Using the standard uplift method, calculate the 2021 provisional installment amount for tax payable by Brown Cows Limited for P2 on 15 January 2021.