How to adequately evaluate the cost of the application?

Question

Mobile development

There is an order to create a certain application (server + client).
How to adequately estimate the cost of creating / maintaining this application?

Answer 1

Usually estimated in hours. For example:
1. Designer. 1000 rub/hour. Approximate calculation: 10 hours of work. Total 10.000
2. Programmer. 1000 rub/hour. Approximate calculation: 40 hours of work. Total 40.000
Total 50.000 + add 25-30% for unforeseen situations. Total 50.000 + 15.000 = 65.000
Here is the price of the project. Further, the company is already free to throw some more margin on top, depending on its greed.
Next, monthly support. Let's say 5 hours a month. 5.000 per month + notorious 20-30% total 7.000 per month.
Something like this.

Answer 2

About the clock above is certainly correctly written.
We count the number of hours, multiply by the cost of one hour +% for all sorts of fakups and prodolbs :)
BUT there is another important point, set a price so that it doesn’t work too hard, if you feel that after the calculations there is too little money, then feel free to set the desired the amount, otherwise the meaning of freelancing is completely lost :)
P.S. Here was another discussion similar How is time recorded when working remotely and hourly pay?