400
The cost to purchase a song from iTunes is $0.99 per song. To purchase a song from Spotify, you must be a member. The Spotify membership fee is $10. In addition, each purchased song costs $0.89. How many downloaded songs, d, must be purchased for the monthly price of Spotify to be the same as iTunes? Write an equation and solve.
0.99d = 10 + 0.89d
d = 100 songs