HELP is for my economics class

The following are budgeted data: january february march sales in units 16,200 22,400 19,200 production in units 19,200 20,200 18,700 one pound of material is required for each finished unit. the inventory of materials at the end of each month should equal 20% of the following month's production needs. purchases of raw materials for february would be budgeted to be:

Direct materials (4.2 x $15) $ 63direct labor ($12 x 17.5) $210manufacturing overhead ($2.40 x 17.5) $42total job cost $ 315dougan, inc. allocates overhead based on a predetermined overhead rate of $2.40 per direct labor hour. employees are paid $12.00 per hour. job 24 requires 4.2 pounds of direct materials at a cost of $15.00 per pound. employees worked a total of 17.5 hours to complete the job. actual manufacturing overhead costs totaled $80,000 for the year for the company. how much is the cost of job 24?

You are the manager of a large crude-oil refinery. as part of the refining process, a certain heat exchanger (operated at high temperatures and with abrasive material flowing through it) must be replaced every year. the replacement and downtime cost in the first year is $165 comma 000. this cost is expected to increase due to inflation at a rate of 7% per year for six years (i.e. until the eoy 7), at which time this particular heat exchanger will no longer be needed. if the company's cost of capital is 15% per year, how much could you afford to spend for a higher quality heat exchanger so that these annual replacement and downtime costs could be eliminated?