Big Book Test 6 Section 4 Q21

[gabhi2001]

Hi folks. Does anyone know how to solve this problem? Based on the chart and its title, the % of inventory of school Y bought in 1975 is 21%, but the answer key has D as the correct answer. I just want to confirm that I am not missing anything.

Here’s the chart:

Here’s the Question:

[Leaderboard]

What percent of School Y's 1977-1978 textbook inventory was : Data Interpretation Sets says C - can you recheck?

[gabhi2001]

You’re correct. Perhaps I just misread. Thank you Leaderboard. You rock