The following data pertain to Colgate Palmolive's liquid filling line during the first 10 months of a particular year. The standard ratio of direct-labor hours to machine hours is 4:1. The standard direct-labor rate is $15.88. Colgate Palmolive: Direct-Labor Efficiency Variance Data* Standard Actual Direct-Direct- Direct-Labor Units Machine Labr aborEfficiency Produced Hours Hours Hours Variance January 50,638 173.5 694.00 390.00 $4,828 February 32,103 108.3 March April May June July August September 31,960 104.0 October 3,227 18,611 213,874725.0 2,900.00 1,519.75 21,918 4,637 6,725 433.20 230.00 185,979 568.0 2,272.00 1,100.00 49,190 168.0 82,996248.0 36,528 112.0 33,803104.0 672.00 380.00 992.00 568.50 448.00 299.00 2,366 416.00 341.50 416.00 351.50 320.00 190.00 2,064 1,183 1,024 28,591 80.0 Source of data: Alan S. Levitan and Sidney J. Baxendale, "Analyzing the Labor Efficiency Variance to Signal Process Engineering Problems," Journal of Cost Management 6, no. 2 (Summer 1992), p. 70. Required: 1-a. Which of the following amounts did Colgate Palmolive use in calculating its standard direct labor hours for the month of January? (Select all that apply.) Units produced Machine hours Actual direct-labor hours Standard ratio of direct-labor hours to machine hours