I can't figure out how they got the answers for Cumulative Total Time: Labor-hours. I was hoping someone could show me the work on how they end up getting the numbers in this colum that have a red mark on them. The red mark indicated I got the wrong answer and they are showing me the right answers in the screen shot below.

World Defense manufactures radar systems. It has just completed the manufacture of its first newly designed system, RS-32. Manufacturing data for the RS-32 follow (Click icon to view data) Requirement Calculate the total variable costs of producing 2, 4, and 8 units. Begin by calculating the total cumulative time in labor-hours. (Round the cumulative average time per unit to the nearest whole number.) Number of units Cumulative average time per unit: Labor-hours Cumulative total time Labor-hours 6,290 10,692 18,176 Now calculate the total variable costs of producing 2, 4, and 8 units. Data Table 3,145 2,673 2.272 $86,000 per unit of RS-32 Direct material cost Direct manufacturing labor time for first unit Learning curve for manufacturing labor time per radar system Dire 3,700 direct manufacturing labor-hours ct manufacturing labor cost Variable manufacturing overhead cost 85% cumulative average time $21 per direct manufacturing labor-hour $11 per direct manufacturing labor-hour Variable costs of producing 2 Units 4 Units 8 Units In 0 85 In 2 0 162519,--0234465 0.693147 aUsing the formula for an 85% learning curve, b = 172,000$ 344.000$ 688,000 224,532 117,612 $ Direct materials Direct manufacturing labor Variable manufacturing overhead Total variable costs 381,696 199,936 1,269,632 132,090 69,190 Print Done $ 373,280 $ 686,144