Respuesta :
$r$ is 116.67 according to the information from the question above where $r$ is the percentage of tip amount to the total check amount of Alejandro and Mia. This problem can be solved by using a simple percentage formula in order to find the tip percentage. The total check amount is $30 and the total tip amount is $35, therefore the tip percentage is 116,67%=35/30*100.