96×7=672 (yuan);

245×4=980 yuan;

367×2=734 (yuan);

(2)890+672+980+734=3276 (yuan)

Answer: the wind bookstore is 3276 yuan.

(3) Why are there no people with profound knowledge of mathematics in the new volume100,000?

7-5=2 (Ben)

Answer: Why are the new 100,000 less than those with profound knowledge of mathematics?

So the answer is:

Why is the title of the book 100,000 yuan? People with profound knowledge of mathematics, unit price of fairy tales and science fiction (yuan) 178 96 245 367 quantity (book) 5 7 4 2 total price (yuan) 890 672 980 734.