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 is $10.

In addtion, each song cost $0.89. Write the equation to determine when iTunes and Napster will cost the same amount.
Equation:

Answer 1

It will take 100 songs for the monthly price of Napster to cost the same as iTunes.

Explanation:

Let's create two equations to represent iTunes (T(d)) and Napster (N(d)):

T(d)=0.99d

N(d)=0.89d+10

In order for us to find when the two prices will be the same, let's set the equations equal to each other and solve for x:

0.99d=0.89d+10

0.1d=10

d=100