Why is it important to study marketing?

The brs corporation makes collections on sales according to the following schedule: 30% in month of sale 66% in month following sale 4% in second month following sale the following sales have been budgeted: sales april $ 130,000 may $ 150,000 june $ 140,000 budgeted cash collections in june would be:

"jake’s roof repair has provided the following data concerning its costs: fixed cost per month cost per repair-hour wages and salaries $ 20,900 $ 15.00 parts and supplies $ 7.70 equipment depreciation $ 2,800 $ 0.35 truck operating expenses $ 5,720 $ 1.60 rent $ 4,690 administrative expenses $ 3,850 $ 0.50 for example, wages and salaries should be $20,900 plus $15.00 per repair-hour. the company expected to work 2,600 repair-hours in may, but actually worked 2,500 repair-hours. the company expects its sales to be $47.00 per repair-hour. required: compute the company’s activity variances for may."

How do you write a business plan ? i will give you a brainliest.