Kelsey must pay $200 to rent a booth at the craft fair. The materials for each pendant cost $7.80, and she plans to sell each pendant for $13.50. To make a profit, she must make more money than she spends. Kelsey has already made 10 pendants.

Part A
Given that Kelsey has already made 10 pendants, how many additional pendants must she make and sell to make a profit of $50?