Respuesta :

$171-$35=$136 (minus out the call out fee since it's only paid once)

$136=the amount of all the hours.
$32= amount per hour

therefore:

$136÷$32 = 4.25 hours.

demical forms to minutes:

0.25 × 60 minutes =15 minutes

4 hours + 15 minutes = 4 hour 15 minutes