Problem 4. Suppose C = 3, S = 31, T = 0.25, r = 10%, K = 30, and P = 2.25. (C: European call price, S: current stock price, T: time till expiration (in years) of both the call and the put, r: annual interest rate in APR, K: strike price, P: European put price.) See if the Put-Call Parity holds. If not, tell me your arbitrage strategy and the exact profit you would receive.