Sally's Software Inc. is a rapidly growing supplier of computer software. Sales for the last five years are given below: Year 2010 2011 2012 2013 2014 Sales ($ millions) $1.2 1.5 2.2 2.7 3.4 a. Determine the logarithmic trend equation. (Round the final answers in millions of dollars to 7 decimal places. Negative answers should be indicated by a minus sign.) b= a = Y'= t b. By what percentage did sales increase, on average, during the period? (Round the final answer to 2 decimal places.) Annual percentage % c. Estimate sales for the year 2017. (Round the final answer in millions of dollars to 2 decimal places.) For 2017, sales = ($ millions)