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The cost of the application depends on many factors, such as the desired functions that the web application should have. The price can also be influenced by the cost of the technical team. I recommend reading this article https://light-it.net/blog/web-application-development-cost-estimation-explained/ which will answer all your questions. Moreover, you will not only learn how the price of web application development is formed, but you will also learn how to reduce the cost.