The answer is 72 (--> second choice).
I can prove it without calculator so you believe me:

Answer: 5^2
Step-by-step explanation:
Since the base are all the same, you will add the exponents and let the exponents stay the same.
5^3 * 5^4= 5^7 * 5^-5= 5^2
24590/12=2029.166....
Your answer would be $2049.17
Answer: b
sorry cant give explanation