Doctors use the term  maximum heart rate  (mhr) when referring to the quantity found by starting with 220 beats per minute and subtracting 1 beat per minute for each year of a person's age. doctors recommend exercising 3 or 4 times each week for at least 20 minutes with your heart rate increased from its resting heart rate (rhr) to its training heart rate (thr), where

thr  =  rhr  + .65(mhr  -  rhr)

which of the following is closest to the  thr  of a 43-year-old person whose  rhr  is 54 beats per minute?