A free app for Android, by Calculation World.
Billing Pad Invoice Generator is a very useful tool to create an invoice and manage your business finances. It is specially designed for shops and business owners to calculate the bill of customers in a short interval by just putting the quantity and unit rate. This app is a practical tool for a general store, medical store, shopkeeper, accounting, and bill of quantity (BOQ), to generate receipts and invoices. You can also print the receipt and share it as a PDF file instantly.
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The app is free to download and is very easy to use, and what's more, you can use it offline too.