Hi @Amirin
Well, you must first define the tasks that you are going to execute, normally in every implementation you will have.
Analysis, Development, Testing and Go Live Stage, depending on the number of days it takes for the tasks that must go into each stage, you add it up and multiply your days by your rate.
There is no calculation guide, it is experience and above all having defined the scope and tasks to be executed, then from there it is necessary to calculate times that will define the cost of the implementation
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