Answer:
a) Breakeven price = Purchase price + Interest amount that would have been earned on the invested amount
Breakeven price = 23 + [23*e^(0.05*1/2) - 23]
Breakeven price = 23 + 0.5822477721
Breakeven price = $23.5822477721
b) Profit = Selling price - Breakeven price
Profit = $23.80 - $23.5822477721
Profit = $0.2177522279 per share