Professional Business Proposal PowerPoint

I need a PowerPoint presentation for a business proposal. The tone must be formal.
27 slides don’t need to be too professional or time consuming just for a school work
ASAP TODAY
Ideal skills and experience:
- Expertise in PowerPoint
- Strong design skills for professional presentations
- Experience in creating business proposal slides
- Ability to convey information clearly and persuasively

Please provide samples of previous work.