Answer:
$0.7
Step-by-step explanation:
number of songs is x
total cost is y
k is the constant of proportionality
k=y/x
k always stays the same for it to be proportional throughout the whole chart.
example=
8.4/12=11.2/16=13.3/19
$0.7 Would be your answer
Hope you get it right!
Have a nice day-
