An investor purchased 20 shares of a certain stock at a price of $45.75 per share. Later this investor purchased 30 more shares at a price of $46.25 per share. What was the average price per share that this investor paid for the 50 shares?

1. 45.80
2. 45.95
3. 46.00
4. 46.05
5. 46.20

[spoiler]OA=D[/spoiler]

Source: GMAT Prep