Answer:
Correct choice is 
Step-by-step explanation:
1. If
then you can find the inverse 

2. If
then

3. Hence,

For
to be conservative, we need to have



Integrate the first PDE with respect to
:

Differentiate with respect to
:

Now differentiate
with respect to
:

So we have

so
is indeed conservative.
Answer:
$1688.26
interest= $188.26
Step-by-step explanation: