please show work so i can understand how to do it in the future

6. A company manufactures and sells bicycle tire pumps. Shown below are some of the costs incurred by the company last year. What is the total of the product costs in the table below? Show your calculations. (1 point) 7. A merchandising company reported the following revenues and costs for November: What is the contribution margin for November? Show your calculations. (1 point) 8. Northern Star, Inc. is a merchandising company. Last month the company's merchandise purchases totaled $42,000. The company's beginning merchandise inventory was $15,000 and its ending merchandise inventory was $12,000. What was the company's cost of goods sold for the month? Show your calculations. (1 point) 9. A company computes its predetermined overhead rate annually on the basis of direct laborhours. At the beginning of the year, it estimated that its total manufacturing overhead would be $700,000 and that the total direct labor-hours would be 50,000 . Its actual total manufacturing overhead for the year was $715,000 and its actual total direct labor-hours were 55,000 hours. Compute the company's predetermined overhead rate. Show your calculations. (1 point) 10. Java Corporation uses a predetermined overhead rate of $28.00 per direct labor hour. This predetermined overhead rate was based on estimated total manufacturing overhead of $280,000 and 10,000 estimated direct labor-hours. The company incurred actual total manufacturing overhead costs of $300,000 and actual total direct labor-hours of 10,500 during the period. What would be the amount of manufacturing overhead applied to jobs during the period? Show your calculations. (1 point)