i just need help with number 3 please and a break down on how to do so. i need to know how to figure this out on a standard calculator only! so please show that way, thank you!

1. Assume that the first installation takes 800 hours, and the team of professionals is paid an average of $50 per hour.Complete the following table for Medcom Company (round answers to one decimal place): Cumulative Number of Systems Cumulative Average Time per System (in Hours) Cumulative Total Labor Hours 1 800 800 2 640 1,280 4 512 2,048 8 409.6 3,276.8 16 327.7 5,243.2 32 262.1 8,387.2 2. Using the data table above, calculate the total labor cost of Medcom installing four systems: Total Labor cost (round to the nearest dollar): 102,400 3. Using the data table above, calculate the following for Medcom to produce a third system: a. Cumulative average time to produce the third system (round to the nearest tenth): hours b. Total time required to produce three systems (round to the nearest tenth) hours c. Time to produce the third system (round to the nearest tenth) hours