A researcher estimates that a fossil is 3200 years old. Using carbon-14 dating, a procedure used to determine the age of an object, the researcher discovers that the fossil is 3600 years old.
a. Find the percent error.
-11.1%
-12.5%
- 88.8%
-112.5%
b. What other estimate gives the same percent error?
___ years old
Explain your reasoning.