Last year, Leisure Time recorded the following data for their production of product X: Month Units Produced Labor Hours January 1,792 10,345 February 1,800 11,365 March 1,735 10,725 April 1,928 12,457 May 2,001 12,598 June 2,245 13,682 July 2,519 13,983 August 2,467 12,972 September 2,582 14,087 October 2,608 15,157 November 2,700 15,245 December 2,735 15,725 The number of units produced is used to measure the level of activity. Using the high-low method, the estimated number of labor hours per unit of production is: 0.15 0.20 5.00 6.25