$4.$ Neo Ventures invests $$15$M in Matrix through pre$-$money SAFE with a pre$-$money valuation cap of $$150$M$.$ Matrix$$s new software shows tremendous promise, and a a year later, it attracted a priced round of funding. Trinity Ventures provides $$25$M in Series A funding for $10\%$ of the firm. Before this priced round, founders and employees owned $20$M shares of common stocks.

a$.$ What are the pre$-$money and post$-$money valuations after Series A$?$

b$.$ What will the ownership structure be after Series A$?$