Sequential Exercise 3.

Extend the previous exercise to produce an invoice. It should include a standing charge of £12.60 and VAT at 5%. Output the information in a suitable format. Use a constant definition for the standing charge.

Algorithm

ElectricCharge
    cost per unit:=0. 667
    VAT:= 0.05
    standing charge:= 12.6
    read present meter reading
    read previous meter reading
    electicity used:= present meter reading-previous meter reading
    amount owed:= electricity used*6.67/100 + standing charge
    write amount owed
End.

PROGRAM: standing.cpp