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blems Calculator Show Me How eBook High-Low Method for a Service Company Boston Railroad decided to use the high-low method and operating data from the past six months to estimate the fixed and variable components of transportation costs. The activity base used by Boston Railroad is a measure of railroad operating activity, termed "gross-ton miles," which is the total number of tons multiplied by the miles moved Gross-Ton Miles Transportation Costs 301,000 $1,128,700 January 1,258,500 336,000 February 218,000 889,400 March 326,000 1,206,600 April 262.000 1,012,000 May 354,000 1,297,400 June