Eco-Market

Near your home, there is a wholesale grocery store called "Eco-Market." In addition to selling goods in the store, the owner also provides delivery services to customers. Here's how it works:
Customers call the seller's mobile number and verbally list all the items they need for delivery. On average, one call takes 5-15 minutes because the seller needs to check the availability of items in real-time, announce the price of each item, record everything in a journal, calculate the total cost using a calculator, adjust the order, and note down the delivery address.

The store receives about 20 such calls daily, which can occupy the seller for up to 5 hours a day and 150 hours a month. Seeing how inefficient it is for the seller to spend so much time on the phone, the store owner decides to order a simple mobile application where customers can place delivery orders online without calling the seller.