Tong creates a portfolio by buying 3 units of a one-year, 1000-strike European call option on a stock and selling 2 units of a one-year, 1200-strike European call option on the same stock.

The premium of a one-year 1000-strike European call on the stock is 94 and the premium of a one-year 1200-strike European call on the stock is 84. The effective risk-free interest rate is 4%.

If the profit on Tongs portfolio at expiration is 181.44, determine the spot price of the stock at expiration.