Arnold buys a one-year 125-strike European call for a premium of $16.86. He also sells a 100-strike call on the same underlying asset for a premium of $31.93. The spot price at experation is $110. The effective annual interest rate is 3.5%. What is Arnold's total profit at experation for the two options?

I have the answer but if would be helpful to get the solutions, as well as the best way to do it/think about it. If that makes sense. Thanks!