solve this question pleaseee

You founded a company 3 years ago, invested $100K, and received 5M shares in this round A. You have gone through 3 more funding rounds since: Round B, in which the PPS was $0.5, and 1M shares issued; Round C, in which the PPS was $2.0, and 0.5M shares issued ; Round D, in which PPS was $4.0, and 0.5M shares issued.

(a) What is your company's pre-money valuation for the series D funding round?

(b) What is your compaby's post-money valuation for the series D funding round?

(c) What percentage of the firm do you own after the series D funding round?