A student sells fancy shirts on campus for $20 each while purchasing them for $10 each. She starts the day with 15 units in stock and $100 in cash. By the end of the day, she has sold 6 units for cash. She then realises that someone stole one of the shirts from her. What was her profit for that day? a. $130 Ob. $110 c. $60 d. $50 e. $40