Turin Corporation, a private company, was incorporated on March 1. The following are selected transactions over the next several months:

Oct.

5

Preferred shareholders converted 2,000 of the preferred shares into common. At that point, it was estimated that the fair values of the common and preferred shares were $10 and $102, respectively.

and the solutions are given as :

Oct.	5	Preferred Shares (2,000 $90)	180,000
		Common Shares		180,000
		To record conversion of 2,000 preferred shares into 20,000 (2,000 10) common shares at an average per share amount of $90.

I do not know where is from $90 dollar. also, why do I have to multiply these two;2000* $90?

where is it from and can you explain this one, please? Thank you.