Offline service cost calculator: working demonstration

Turn repeated manual pricing calculations into a calculator with a clear total and breakdown. Enter the quantity, unit rate, extra charges and discount, then see the total and a breakdown. The result can be saved as a TXT file.

This is a self-initiated, AI-assisted demonstration using fictional prices, not a client engagement. The example calculation is 12.5 x 320, plus 500 and 250, with a 10% discount: 4,275 RUB. The calculation rules and error cases have been checked.

The delivered format is a local HTML file with source code and a short guide. It needs no account or hosting. The custom package covers one agreed formula, up to five numeric fields and one screen. Before taking a project, I review the rules, example answers and the desktop browser that will be used. Website installation, shared databases, payments and external APIs require separate scoping.