A company issues shares $3$ times over a $5-$year period.

Round $1=5000$ shares at $$5$ per share

Round $2=5000$ shares at $$10$ per share

Round $3=5000$ shares at $$20$ per share

The book value of shares in Round $3=$

Group of answer choices

a$)$ $$175000.$

b$)$ $$100000$

c$)15000$ shares

d$)$ $$300000$