Explain industry - standard techniques and methods to perform routine calculations.

My teacher feedback is:

Your explanation in the first sentence mentions some standard mathematical calculations rather than techniques and methods used to perform routine calculations. Perhaps you could identify some examples of the routine financial calculations performed. eg. Cash registers and calculators pre-programmed to calculate GST, or to calculate a merchant fee on a transaction. Spreadsheets with inbuilt formulae to calculate Budgeted amounts based on % increases/decreases.