Read the following context and answer the question.
Context: Roland took the kids shopping for school supplies . He came back miserable that he had spent $ 100 . The kids wanted these fancy binders , and mechanical pencils , and Gary wanted a little white board to write his assignments on . Then he just bought erasers and notebooks and stuff .
Question: Why was Roland so upset ?
Answer:


Because he had n't anticipated the extent of his kid 's demands