please answer 7 and 8.. and show work please

During the month, 200 units were produced, with no defects, requiring three setups. Each unit consisted of 17 parts, 3 direct labor hours and 2.5 machine hours. Direct materials cost $50 per finished unit. What is the per unit manufacturing cost for the period? 7. Office Supplies Only store costs are expressed as a function of the unit sales of its two products: office chairs and task desks. Assume fixed costs are $11,000 per month and the variable costs are $60 per office chair and $125 per task desk. What are Office Supplies Only's estimated costs for the month if 150 office chairs and 80 task desks are sold? 8. Given the equation, Y=4,000+2.5X. The coefficient of determination (RSquared) is calculated to be 0.80 (or 80% ). In this equation, what does RSquared imply