The president of Normolle Mfg. Co. which manufactures only one product, requests an analysis of the causes of the change in gross profit. An investigation reveals the following: 2020 REQUIRED: 1. A detailed analysis of the causes for the change in gross profit graphically. The Shelle-Macke Mining Co. mines Slomac, a commonly used mineral. For the years 2019 and 2020, the company's comparative report of operations showed: REQUIRED: 1. A detailed analysis of the causes for the change in gross profit graphically. On Jan. 1, 2020, the selling price was increased by 371/2%