Question 1 (20 marks) (a) Consider the following problem specification that requires the development of software that computes the monthly water bill for the West of England (WoE) Water customers. A customer's monthly bill includes a 25 water demand charge plus a consumption (usage) charge of 0.90 for every thousand gallons of water used. Consumption of water is figured from current and previous meter readings (in thousands of gallons). Current meter reading is the one most recently taken and the previous meter reading is the one taken at the end of the previous quarter. If the customer's unpaid balance is greater than zero, a 5 late charge is added to the bill as well. A printed bill needs to be generated. Design a structure chart (structure diagram) for the water bill software. The structure chart should show information passing between the modules. (Note: A STRUCTURE CHART, NOT A FLOWCHART, IS REQUIRED). (10 marks)