Which calculation should be completed first to solve this story problem?
Allister bought some sheet music. He bought 6 songs for $0.99 each and 1 book for $16.99. He paid $1.38 in sales tax. He gave the cashier $50. How much change should Allister get?
A.
total cost of all the purchases
B.
total cost of 6 songs
C.
sum of the cost of 1 song, the book, and the tax
D.
the change