Final answer:
To find the number of registered voters, set up a proportion using the given information.
Step-by-step explanation:
To find the number of registered voters, we can set up a proportion using the given information. Let x represent the total number of registered voters.
We know that 30% of the registered voters cast 100,200 votes. This can be expressed as:
30% / 100 * x = 100,200
Simplifying the equation, we get:
0.3x = 100,200
Dividing both sides by 0.3, we find:
x = 100,200 / 0.3
x = 334,000
Therefore, there are 334,000 registered voters.