It turns out that science and technology books account for 3/(2+3)=3/5.

Now it accounts for 4/(4+5)=4/9 of the total.

The original book is now 4/9÷3/5=20/27.

Now the total is 350 ÷ (1-20/27) =1350.

Original literary works (1350-350) x (1-3/5) =1000x2/5 = 400.

Increase by 350÷400=87.5%

If you don't understand, you can ask.

If it helps, remember to adopt it. Thank you.

I wish you progress in your study!