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counting and probability intermediate

Problem

Each day Walter gets dollars for doing his chores or dollars for doing them exceptionally well. After days of doing his chores daily, Walter has received a total of dollars. On how many days did Walter do them exceptionally well?
(A)
(B)
(C)
(D)
Solution
If Walter had done his chores for days without doing any of them well, he would have earned dollars. He got dollars more than this. He gets a dollar bonus every day he does his chores well. Thus, he did his chores exceptionally well days, and the answer is .
Final answer
A