###### Exercise75

Target heart rate for moderate exercise is \(50\%\) to \(70\%\) of maximum heart rate. If we want to represent a certain percent of an individual’s maximum heart rate, we’d use the formula

\(\displaystyle{\text{rate}=p(220-a)}\)

where \(p\) is the percent, and \(a\) is age in years. Determine the target heart rate at \(68\%\) level for someone who is \(13\) years old. Round your answer to an integer.

The target heart rate at \(68\%\) level for someone who is \(13\) years old is beats per minute.