Really Fast Delivery Services has the collected the following information about operating expenditures for its delivery truck fleet for the past five years: Year Miles Operating Costs 2009 110,000 $390,000 2010 140,000 $420,000 2011 100,000 $360,000 2012 130,000 $410,000 2013 170,000 $450,000 Using the high-low method, what is the cost estimate for variable costs for 2014? $1.29 $2.00 $1.60 $1.50