#### Explanation:

The formula for calculating the percent change over time is:

$p = \frac{N - O}{O} \cdot 100$ where $p$ is the percent change, $N$ is the New Value and $O$ is the Old Value. In this problem we are given $p$ (36) and the New Value ($578,000). We can substitute this into the formula and solve for $O$: $36 = \frac{578000 - O}{O} \cdot 100$$\frac{36}{100} = \frac{578000 - O}{O} \cdot \frac{100}{100}$$\frac{36}{100} = \frac{578000 - O}{O}$$\frac{36 \cdot O}{100} = O \frac{\left(578000 - O\right)}{O}$$0.36 \cdot O = \cancel{O} \frac{\left(578000 - O\right)}{\cancel{O}}$$0.36 \cdot O = 578000 - O$$0.36 \cdot O + O = 578000 - O + O$$1.36 O = 578000$$\frac{1.36 O}{1.36} = \frac{578000}{1.36}$$\frac{\cancel{1.36} O}{\cancel{1.36}} = 425000$$O = 425000\$