7.You are a speculator who sells a call option on Swiss francs for a premium of $.06, with an exercise price of $.64. The option will not be exercised until the expiration date, if at all. If the spot rate of the Swiss franc is $.69 on the expiration date, your net profit per unit is:

a.-$.02.

b.-$.01.

c. $.01

d. $.02

e.None of the above.

I know the answer is C(.01) but don't know how. please list formula and work.