Your comparison of the gross margin percent for Jonier Drugs for the years 2013 through 2016 indicates a significant decline. This is shown by the following B(Cick the icon to view the information) The following additional information is obtained from independent sources and the client's records as a means of investigating the controller's explanations: (Cick the ieon to view the additional information.) Requirements a Evaluate the explanation provided by Amberson. Show calculations to support your conclusions. b. Which specific aspects of the client's financial statements require intensive investigation in this audit? Requirement a. Evaluate the explanation provided by Amberson Show cakculations to support your conclusions First, compute the gross margin percentage for drug sales for 2016 through 2013, thjen, compute the gross margin percentage for nondrug sales for 2016 through 2013 (Round your answers to the nearest tenth percent. XXX% ) Drugs 2016 2015 2014 2013