I want to know the answer to the following question:
The number of books about religion in Paris from 1720 to 1780 dropped by what percentage?
All the background I'm provided with is that "Reflecting the decreasing influence of religion, the number of books about science and art published in Paris doubled from 1720 to 1780, while the number of books about religion dropped to just one-tenth of the total.". Is that enough to answer the question?