Answer:

--- Percentage increase
Step-by-step explanation:
Given
Let


So, we have:
--- Monday
--- One month later
Required
The function
The function is represented as:

In
, we have:


Rewrite as:

In
, we have:


Substitute 

Solve for b


Recall that:

Hence, the function is:

To get the monthly percentage increase (r), we have:

Compare to: 
So:

Make r the subject



Express as percentage


Answer: 1. B 10(15 12 + 8) = 350
2. C
Step-by-step explanation:
the answer to that question is 31.80