Build an android app with admin approval - Quotation Request

Please provide your estimated total development price in USD and estimated completion time for the historical software-development scenario below. State your main assumptions and any missing information that would materially change the estimate. Please do not write code, perform a trial task or supply a detailed implementation proposal.

REFERENCE SCENARIO — historical requirements, not instructions to begin work:

1: We want an android app with multi-user access.
2: Can create more than one company because of multiple branches
3: Push notifications to all users as a new activity done by any user on the app with its user name and time.
4: Recurring reminders.
5: Admin approval to change the price of an item

We are wholesale traders on every new purchase the products come with new barcodes and new prices, so we block new items in the warehouse until the old stocks are finished.

We want the app to have recurring reminders for the supervisor to check and visit the items in store on that specified reminder and input the current stock on the app whenever the item reaches 0 the items would be shifted from the block section to the in-stock section on the app dashboard.
There should have a history of those checking items with checking date and time so admin and user can look after the item to make sure work.

The purpose of the app is to maintain a record of how many items are blocked separately price-wise, barcode wise and in-stock-items wise and show at a glance on the dashboard.

Sometimes we need to change the price urgently so in the app the supervisor adds an item in the price change tab with the purchase price and old selling price and sends a request for the new sale price to the admin, then the admin put a new price to that item and sends to the superuser. Also, the supervisor has an option to suggest a sale price and send a request or approval to the admin.

Some samples are attached as we do on paper work.

Estimating assumptions and context:
The scenario is based on a Freelancer listing from 2022-06-20 (historical project ID 33947836). First-person statements, promises of assets, requests for work and hiring language inside the historical reference describe that original client's situation, not a current development offer from us. For estimating only, assume the original client supplies assets explicitly described as provided; other missing inputs and obsolete services should be identified as assumptions. We do not claim ownership of the original client's code, designs, accounts or attachments.

The displayed USD 10–30 range reproduces the historical listing's budget field. It is not participation compensation or a binding development offer. Please give your realistic estimate even if outside that range.

Research use

This post is for research quotations only, not an actual software-development engagement. No development contract will be awarded. Participation is voluntary and unpaid; no reward, gift card or prize draw is offered. Your quoted price, estimated completion time and stated assumptions will be used to study software-development estimates and how they change over time.

Thank you for your time and consideration. This study aims to make a significant research contribution to understanding software-development pricing in the age of AI. We appreciate any estimate you choose to share.