Gargymal Company would like to estimate the variable and fixed components of its electrical costs and has compiled the following data for the last five months of operations. August September October November December Machine Hours Electrical Cost 1,000 $1,550 900 1,510 1,500 1,750 2.000 1.950 1,300 1,670 Using the high-low method of analysis, the estimated fixed cost per month for electricity is closest to