The answer that I had gotten to my answer was the third one.
You would have to set you problem up like
x 40
____=_____
720 100
you would multiply 40 by 720 then you would divide 28,800 by 100 your answer will be 288.
ANSWER

or

We have

Since we cannot factor easily, we complete the square.
Adding 2 to both sides give,

Dividing through by 3 gives

Adding

to both sides gives

The expression on the Left Hand side is a perfect square.




Splitting the plus or minus sign gives

or
I agree the answer is B I think so
1) Gathering the data
P=$6200
F=7310
t= 3 yrs
2) Since it is a simple interest, it is a linear application. So we can find it using this formula: