let x = cost per 1 download (rate of cost per download) now we set up a proportion: [tex] \frac{1}{8} = \frac{x}{10.32} [/tex] 1 download OVER 8 downloads EQUALS x (see top for x) OVER $10.32 when we cross multiply, we get 10.32=8x divide both sides by 8 to get: 1.29=x so the rate of cost per download is $1.29
