Final answer:
The common factor for 200% growth is 3, meaning the original amount has increased by two times its original value plus the original value itself, totaling three times the original amount.
Step-by-step explanation:
The common factor or ratio for 200% growth is equivalent to a tripling of the original amount. When something grows by 200%, it means the original amount has increased by two times its original value, plus the original value itself, resulting in a total of three times the original amount. Therefore, the correct answer is c) 3.
To clarify with an example, if you start with $1 and it grows by 200%, you would calculate the growth as 200% of $1, which is $2, and then add the original $1 to get a total of $3. Hence, the common factor is the amount it has increased to, divided by the original amount, which in this case is $3/$1 = 3.