Maxwell bought a new pair of skis for $350. He put $110 down and received a student discount of $30. His mother gave him 1/2 of the balance for his birthday. Which of these expressions could be used to find the amount Maxwell still owes on the skis?
A. 350−110+30÷2
B. 350−(110−30)÷2
C. [350−(110−30)÷2]
D. [350−(110+30)]÷2
