The questions are on this picture. Thanks

Question 11 15 marks! a) 13) Corelli's sh shop, MoFresco, has been testing the demand for its salmon and tuna. When it increased the price of salmon from $25 to $30 a kilogram, the quantity demanded for tuna increased from 400 kilograms to 440 kilograms a month. If the price of tuna did not change, what is the cross price elasticity of demand for tuna with respect to salmon? Are tuna and salmon substitutes or complements? Why? (3 marks) You are the sales manager of a mobile phone company. You notice that when you increased the price of your service, your total revenue rose. What conclusion can you draw about the price elasticity of demand for your mobile phone service? Explain your answer. (2 marks)