The homework question seems to be about calculating utility bills, possibly involving water and sanitation charges, with specific data missing from an image.

It appears there is missing information in the provided image, specifically the details within the table for question 2.4 (Prices per kilolitre, Number of litres, Cost per Step) and any context that would allow for the calculation of the sewer charge or the current cost of water in Step 7. I will proceed by making the most reasonable assumptions based on the visible information and common utility billing practices.

Assumption 1: For question 2.4, "value A, the sub-total for water and sanitation excluding VAT" is directly given in the table as the "SUB-TOTAL R1 245.63". Therefore, $A = \text{R}1245.63$.
Assumption 2: The standard South African VAT rate of