Armer Company is accumulating data to use in preparing its annual profit plan for the coming year. The cost behavior pattern of the maintenance costs must be determined. The accounting staff has suggested the use of linear regression to derive an equation for maintenance hours and costs. Data regarding the maintenance hours and costs for the last year and the results of the regression analysis follow:

MonthMaintenance CostMachine HoursJan.$4,600640Feb.3,400480Mar.4,000560Apr.3,220460May4,750660June3,360470July3,430480Aug.4,870700Sept.4,660650Oct.4,450630Nov.3,700510Dec.3,560500Sum$48,0006,740Average$4,000$562Average cost per hour$7.00a (intercept)$38.71b (coefficient)7.0527Standard error of the estimate52.8466R-squared0.9935t-value for b39.130

Based on the data derived from the regression analysis, 420 maintenance hours in a month mean that maintenance costs should be budgeted to the nearest dollar at