Answer:
B.
Explanation:
See attachment for complete question
Analysing each of the options.
Option 1. 1 to 400
First, calculate the difference
Difference = 400 - 1 = 399
Then divide by the initial values
%increase = 399/1
%increase = 399
Convert to percentage
%increase = 399 * 100%
%increase = 39900%
This doesn't represent 400% increase
Option 2: 9 to 45
First, calculate the difference
Difference = 45 - 9 = 36
Then divide by the initial values
%increase = 36/9
%increase = 4
Convert to percentage
%increase = 4 * 100%
%increase = 400%
This represent 400% increase
Hence, option B answers the question.