Please answer the following question:
Question 1: What is the effect of a second round of financing on the ownership percentages of the founders and the initial first-round investors?
Question 2: How and why does the first-round investors' ownership percentage change between rounds 1 and 2?
Question 3: How and why does the founder's ownership percentage change between rounds 1 and 2?
Note: Explain all steps comprehensively.