208 yuan, ok, it seems that I only gave 208 yuan. You won't accept it, will you?

Suppose the actual price of the first book purchase is one yuan.

Then a*0.9=64 yuan a=64/0.9=7 1 yuan.

First deposit =7 1-64=7 yuan.

Second deposit =34-7=27 yuan.

Assuming that the actual payment for the second book purchase is B yuan, then the price of this book is b+27 yuan.

[(b+27)-200]*0.8+200*0.9=b=208 yuan.