Answer:

B. 20
Step-by-step explanation:
<em>First, you divide by 5 from both sides of equation.</em>
<em>
</em>
<em>Simplify, to find the answer.</em>
<em>
</em>
<em>
, which is our answer.</em>
4500 = 4.5 * 10^3
57 = 5.7 * 10^1
730 = 7.3 * 10^2
0.007 = 7 * 10^-3
300.25 = 3.0025 * 10^2
56,325.2 = 5.63252 * 10^4