The total amount of money Christina spent on streaming music service in a year is $36
Total yearly cost = One time payment + Cost of each song(Number of songs)
= 18 + 1.20(15)
= 18 + 18
= $36
Therefore, the total amount of money Christina spent on streaming music service in a year is $36
Learn more about total cost:
https://brainly.com/question/2021001
#SPJ1