Jane operates a pharmacy in Town A and she has a variety of goods stocked up for Covid-19 ranging from face masks to vitamins to boost immunity.

The following table shows selected data from her pharmacy:

Price of hand sanitizers (per 50 ml. bottle)	Bottles of hand sanitizers demanded in a month	Packets of alcohol wipes demanded in a month
RM5.80	1,000	200
RM7.20	700	375

a) Using the mid-point method, calculate the price elasticity of demand for hand sanitizers. Assume that the price of hand sanitizers increases. (3 marks)

b) All economics students were taught the concept of price elasticity of demand. How is this knowledge useful to Jane if she seeks to increase her total revenue? Explain your answer using relevant graphs. (6 marks)

c) Using the mid-point method, calculate the cross-price elasticity of demand for alcohol wipes. Assume that the price of hand sanitizers increases. (3 marks)

d) How is the knowledge of cross price elasticity of demand useful to Jane? Explain your answer using relevant examples. (6 marks)

e) Although quantity demanded for hand sanitizers dropped when price increased from RM5.80 to RM7.20, there was still shortage of hand sanitizers because Jane's supply of hand sanitizers is relatively price inelastic. Provide TWO (2) possible reasons for this inelasticity. (3 marks)