I don't understand what Val(post) is, what 10% options actually means (who gets the options?) what "Other pro-rata" means, etc.
TL;DR: A really simple funding contract.
Developed at YC, often used by YC companies. Investor gives money now and, in the future, gets a discount on the company's shares or pays a lower price when the startup does well.
https://www.youtube.com/watch?v=zBUhQPPS9AY&t=15m35s