It is very much useful to write this document and attach with the cost quotation especially in case of large deals and when potential customers hit your platform. In this case you have gained their loyalties by exposing them a limited portion of your classified cost details and also give them some space to elaborate their mindset.
Supporting details added in this letter are much helpful to convince your client for following stage condition and they might be agreed for working with you. Further you can ask them if they want any sequential change in it.
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