Alan is saving for a surfboard. He has saved $200 and he earns $15 per hour life guarding. If the total money saved (s) after (h) number of hours worked is given by the equation s = 15h + 200, how many hours will he need to work in order to earn $350 for his surfboard?

A. 3 hours
B. 8 hours
C. 10 hours
D. 30 hours