please help me with this equation and provide step by step solutions. thanks

Week 7: Homework Saved 3 a. Complete the following table and answer two questions about costs. 10 Instructions: Enter your responses rounded to the nearest whole dollar. If you are entering any negative numbers be sure to include a points negative sign (-) in front of those numbers. Rate of Output Total Cost Marginal Cost Average Cost ebook 0 45 50 50 50 0 N - 63 32 Ask 79 26 105 S 26 Print 143 28 b. What output has the lowest per-unit cost equal to marginal cost? units References c. What is the value of fixed costs