I truly believe the answer would not be easy and straightforward. Instead, I would argue that it depends on many more important factors. The most important is the targeted grant itself and its criteria and scope. You have to check what is the covered research area and how does this related to your intended proposal.
Sometimes having a look into the previous granted proposals from the same selected grant would offer a great help. Well-written proposal, solid and clear problem statement, well-established solutions\ideas, and well-defined milestones would help as well. Selecting a perfect and "smart" title (e.g. don't use too much keywords, make it short and strong, do highlight what is so special about your proposal).
previous related projects and experienced research member would reflect the seriousness and the potential to complete the project successfully.
Each funding agency has specific instructions on what you should or should not include in your budget, and most often you will find on-line spreadsheet (or at list instructions in the RFP) with budget categories. This can get you started. Next step - you need to decide what personnel is necessary to complete all tasks you setup in your research proposal. Usually higher education institutions will have grants office that could provide you with pay rates for different level staff (faculty, postdoc, graduate student, clerical staff). The OTPS (other than personnel expenses) should include whatever equipment you need (if any), cost of facilities, if you college does not provide you with the space, any materials, and travel and publication costs. Hope that helps you to get started.
Many thanks for your comments on how to decide budget. Your informations are very useful to improve my proposal. I would keep in mind your comments/suggestions while preparing proposals.
Overall Quality of the Study ∗ Good research question ... may have specific high ... Writing an Effective Research Proposal . Writing an Effective Research Proposal ...
2. How To Write a Research Proposal - MIT OpenCourseWare