Altawfik Corporation is estimating the cost function for total cost of production of product A using the two points method. The data collected for the past year is as following:

Number of units Total

Quarter produced Costs

1 4,000 $ 1,000

2 5,400 1,280

3 7,000 1,600

4 9,000 2,000

Using the two points methods, choose two points with which you estimate the cost function.