Return to the worked example data shown in Table 2.2

(a) Calculate the percentage of total transactions split between credit cards and debit cards and show the results in a suitable diagram. Comment on what you see. How many significant figures do you think should be used for the percentage data?

(b) Calculate the average spend per transaction each year, split by total, credit card and debit card. Comment on the results.

(c) Show the average spend as a deflated index. Comment on the results.