SECTION C (20 marks) The following table reports the sales and expenses for JB Hi-Fi limited for the period 2015-2019. Business Summary: JB Hi-Fi Limited (JBH) is a specialty discount retailer of branded home entertainment products. The Group's products focus on consumer electronics, software (including music, games and movies), whitegoods and appliances. The company primarily operates from standalone destination sites, shopping centre locations and its online stores in Australia and New Zealand. Product information: The Group operates in one product and services segment, being the sale of consumer electronics products and services, including televisions, audio equipment and computers, cameras, telecommunications products and services, software, musical instruments, whitegoods, cooking products, small appliances, digital content and information technology and consulting services. JB Hi-Fi Limited Financials 06/2015 06/2016 06/2017 06/2018 06/2019 Revenue ($'000) 3,652,136 3,954,467 5,628,000 6,854,300 7,095,300 Cost of Goods Sold ($'000) 2,853,883 3,089,059 4,397,500 5,384,100 5,568,200 Gross Profit ($'000] 798,253 865,408 1,230,500 1,470,200 1,527,100 Operating expenses ($'000) 3,411,065 3,691,788 5,268,000 6,443,200 6,669,400 Profit (EBITDA) ($'000) 241,702 263,225 362,000 412,200 428,300 Sales and marketing expenses ($'000) 374,084 404,575 580,100 695,100 731,000 Questions Based on the data file, answer the following questions: 1. Calculate the following marketing ratios for the 2018 and 2019 periods: a. Return on sales and marketing investment (2 mark)