Genetics: Analysis and Principles 5th Edition by Robert Brooker

Exercise 13

During an Ames test, bacteria were exposed to a potential mutagen. Also, as a control, another sample of bacteria was not exposed to the mutagen. In both cases, 10 million bacteria were plated and the following results were obtained:
No mutagen: 17 colonies
With mutagen: 2017 colonies
Calculate the mutation rate in the presence and absence of the mutagen. How much does the mutagen increase the rate of mutation