For example, based on the table above, for a $50-$year$-$old person $($i$.$e$.,$ age$=50)$ doing moderate$-$intensity physical activities, the estimated heart

rate in beats per minute $($bpm$)$ should be between $109$ and $129,$ where these two rounded integers can be obtained as follows:

$(220-50)0\mathrm{.}64=109$

$(220-50)0\mathrm{.}76=129$

where $(220-50)0\mathrm{.}64=108\mathrm{.}8$ should be rounded to $109$ using the built$-$in function round.

As another example, for a $20-$year$-$old person $($i$.$e$.,$ age$=20)$ doing vigorous$-$intensity physical activities, the estimated heart rate in bpm should be

between $154$ and $167,$ where these two rounded integers can be obtained as follows:

$(220-20)0\mathrm{.}77=154$

$(220-20)0\mathrm{.}93=186$

Write a function hrate that consumes two parameters age and intensity where age is an integer and intensity is each one of 'moderate,

$\text{'}$ vigo rous, representing the physical activity intensity. The function produces the following string:

"Target heart rate range: A $-$ B bpm$"$

where A and $B$ are the estimated minimum and maximum age$-$related heart rates, respectively. use drracket