2.2 Cadbury Schweppes owns and operates a chain of 12 vegetable protein "hamburger" outlets in northern Louisiana. Sales figures and advertising expenses for the stores are provided in the table below. Sales are given in millions of dollars; advertising expenses are in tens of thousands of dollars. Calculate a regression line for the data. What is your forecast of sales for a store with advertising spending of R240,000? R300,000? (10 marks)