Question

The cost to purchase a song from iTunes is $0.99 per song. To purchase a song from Napster, you must be a member. The Napster 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 Napster to be the same as iTunes?

Please help me and show the work for this!

Answer 1

d=100

Explanation:

.99d=10 + .89d

subtract .89d from both sides

.1d=10

divide by .1 on both sides

d=100

to check plug in 100 in place of d