Two customers went to a hardware store to buy pepper plants and tomato plants. Each pepper plant costs the same amo unt, and each tomato plant costs the same amount. The first customer paid $66.30 for 12 pepper plants and 6 tomato plants. The second customer paid $81.60 for 9 pepper plants and 12 tomato plants. What was the cost in dollars for each pepper plant? A $3.89 B $3.40 C $5.53 D $4.25