The Ladder Company Wants to Develop a Cost Estimating Equation

Multiple Choice

The Ladder Company wants to develop a cost estimating equation for its monthly cost of electricity. It has the following data: Using the high-low method, which of the following is the best equation?

A) Y = $900 + $12.00X
B) Y = $900 + $8.40X
C) Y = $1,800 + $8.40X
D) Y = $2,400 + $8.40X