International Business Machines Corporation (IBM) reported the following on its 2018 form 10-K. $ millions 2018 2017 2016 $71,632 $71,225 $71,927 Total revenue Research, development and engineering expense 5,379 5,590 5,726 Number of new patents awarded 8,190 8,139 7,279 Required a. Calculate IBM's common-size research, development and engineering expense for each year. What pattern do we observe? Note: Round percentage to one decimal places (for example, enter 6.7% for 6.6555%). 2018 RD&E expense common-size RD&E Expense relative to sales has RD&E per patent as a percentage RD&E spending per patent 2018 2017 96 96 b. Compute the research, development and engineering expense per new patent for each year. What pattern do we observe? Note: Round percentage to one decimal places (for example, enter 6.7% for 6.6555%). 2017 2016 96 96 over the years from 2016 to 2018. 2016 over the years from 2016 to 2018.