I have some problem solving break even in spreadsheet, If anyone would be kind enough to help me I would be very thankful

The firm’s costs are as follow:

Overheads “a”= £800,000

Labour cost per unit “b”= £100

Raw material per unit “c”= £258

Advertisement cost are “D” = £40,000 per period on advertising and are capable of producing up to 1000 units in each period.

Total cost function is expressed by

TC= a+bQ+cQ+DThe demand function is

P= j-kQ + m√DWhere j=4000 k=3 and m = 3 D= advertisement cost

·What is the breakeven level of output?

· What is the breakeven level of output If the cost increase by 10%?

· If advertisement cost doubles what is the breakeven level of output?

P.S I would be happy If anyone can solve it in excel or otherwise put it in words with formula “how to solve it in excel” because I also have to make diagrams. Thank you