Startup Idea: Software Solution for Accurate Change Dispensing in Retail

Startup idea to develop a software program that monitors the weight of individual banknote nominations and provides alert prompts for staff in case of discrepancies in change given to the customers in retail store settings.

I work in a department store in the retail sector and it is my job to monitor the finances of the building. Staff are incorrectly giving the wrong amounts of change to customers quite frequently and it is costing the business. I think that there could be a software program that could monitor the weight of individual nominations as they all weigh different amounts, so therefore the till could successfully track if the right/wrong amounts of change were being given via the weight leaving the change drawer and it could then alert the member of staff via a prompt. Maybe a message on screen, light, or noise.