The direct labor cost of making airplanes decreases with repetition (learning curve). As a result, the cost of manufacturing of airplanes depend on the unit production number (first, fifth, 10^th, 50th, etc.). The following data shows the direct labor cost for selected production numbers.

Airplane # (X)	1	8	16	32	64	130	200	300	400	500	600
Labor Time (Y)	7300	6500	5400	5000	4500	4200	4100	3500	3200	3000	2800

Using Excel graphs, find linear, power, exponential, and logarithmic fits for this dataset. Make sure to include equations and R² for each fit. Insert all graphs here and select the best model based on R². Rank the models based on the value of R². Which model fit is the best?

If an airplane manufacturer charges $150 per hour for direct labor cost, find the total labor hours and labor cost if a small airliner orders 10 airplanes (#700 to 709).