###### Exercise 57

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

\begin{equation*}
\text{rate}=p(220-a)
\end{equation*}

where \(p\) is the percent, and \(a\) is age in years.

Determine the target heart rate at \(51\%\) level for someone who is \(43\) years old. Round your answer to an integer.

The target heart rate at \(51\%\) level for someone who is \(43\) years old is beats per minute.