The following six months of data were collected on electricity cost and the number of machine hours in a factory.

Month

June

July

August

September

October

November

Required:

Using the high$-$low method, compute the variable rate for the electricity cost.

Using the high$-$low method, compute the fixed cost of electricity.

Estimate the total electricity cost to be incurred in December if $5,300$ machine hours are incurred.