Josie is a personal trainer. For each of her clients she sets a target heart rate for training.

A person’s target heart rate is a percentage of their maximum heart rate (MHR).

MHR is measured in beats per minute.

A formula for calculating MHR is:

MHR = 217 - (2/3 x Age in years)

Ian is another of Josie’s clients. He is 60 years old. What is the MHR for Ian when he is training?
A.60
B.177
C.197