Single- step Income statement

Case study:

Perfect printer finished its first year of activity with a few financial ups and downs.

See below their financial records for each quarter:

1) January to March 2020:

Their fixed cost was 18000$ for the first six month as they were selling the printers for 240$.

The cost of production of each printer was 60 $.

They could sell an average of 107 units per month for that quarter.

How much was their net income for that period?

2) From April to June 2020:

They hired a senior product manager, Julie, to develop the sales.

Julies salary is 72000$ per year and she has only 3 months to prove her competencies and abilities.

She could increase the sales by an average of 9units per month.

The firm decides to recalculate everything and provide a quarterly income statement.

Does the firm keep Julie?

3) From July to September 2020, the firm took advantage of the back to school season and could increase the sales for 20% comparing to the first quarter.

How much is the gross and net profit of the quarter?

4) For the last quarter, the marketing department of the firm decides to launch a new marketing campaign for Christmas that increased the variable cost for 10%. However, this marketing campaign could also increase the sales for 30% comparing to the first quarter. How much is the net profit in this case for this quarter?