Answer
800,000 bytes
Work Step by Step
There are 100 records of 200 characters each in a single page, so there will be $100\times200 = 20000$ characters in one page.
Each character requires 2 bytes so 20000 characters will require 40000 bytes.
There are a total of 20 pages so the total number of bytes will be -
$20\times40000 = 800000$ bytes.
