please help me solve # 23&26 . thank you

Acme Inc. plans to add a new product line. The project requires an initial investment of $285,000, has an expected useful life of 9 years, and has an expected terminal value of $15,000. The project is expected to generate the following annual revenues and expenses: What is the payback period of this project in years? Round to one decimal point. 4.6 years 4.4 years 8.4 years 8.9 years None of the above Which of the following statements best describes why the use of a single plantwide rate to allocate manufacturing overhead may distort products costs? The use of robotics has increased the correlation between direct labor hours and the actual amount of overhead costs associated with specific product lines. The practical difficulties of accurately measuring the direct labor hours associated with specific batches in a job order cost system. The practical difficulties of accurately measuring the machine hours associated with specific batches in a job order cost system. The bookkeeping costs of combining the different types of overhead costs-indirect labor, indirect materials and other overhead-into a single cost pool. The increase in overhead costs as a percentage of total manufacturing costs, in concert with an increase in the diversity of the product lines that companies produce