Build a voice based billing calculator

I have the list of products of my store. Wanted to create a voice based calculator based on the product list and item price. So, suppose I have sold 1 plate of plain rice, 1 dal makhani, 2 dahi bhalla, I just wanted to say the same and the calculator should tell me/write 4 items and xxx Rupees. Similarly I want to say 1kg rice, 2 kg moong dal, 1 ltr oil and 1 packet Parle G and the calculator should tell me 4 items and xxx Rupees The google document is attached for your reference https://docs.google.com/spreadsheets/d/1fKz49sNzfThM8iUWzblXMGSscQ3D_b4hTdi_kymbefI/edit#gid=0