The stock price of Greengold Corp. is $$18$ per share, and the formula for market capitalization is as follows:

Market capitalization $=$ Stock price per share $$ Total number of shares in marketplace

If Greengold's total number of shares in the stock market is $10$ million, what is their market capitalization?

a$.)$ $$180$ million

b$.)$ $$10$ million

c$.)$ $$480$ million

d$.)$ $$18$ million