Inspection costs at one of Ratulowski Corporation's factories are listed below: Units Produced 925 989 931 915 April May June July August September October November December Inspection Costs $18, 212 $18,600 $ 18, 265 $18, 110 $18, 294 $18,180 $18,332 $17,560 $18, 138 937 922 939 879 918 Management believes that inspection cost is a mixed cost that depends on units produced Using the high-low method, the estimate of the fixed component of inspection cost per month is closest to: (Round your intermediate calculations to 2 decimal places.)