The price of ground coffee beans is d dollars for 8 ounces and each ounce makes c cups of brewed coffee. In terms of c and d, what is the dollar cost of the ground coffee beans required to make 1 cup of brewed coffee?

a) $\displaystyle \frac{d}{8c}$

b)$\displaystyle \frac{cd}8$

c)$\displaystyle \frac{8c}{d}$

d)$\displaystyle \frac{8d}{c}$

e) 8cd

I think its because because: if you have d dollars for 8 ounces. Then 1 ounce would be $\displaystyle \frac{15}{8}$ And if ONE ounce is needed to make 1 cup of brewed coffee so then $\displaystyle \frac{cd}{8}$

but why is the correct answer $\displaystyle \frac{d}{8c}$??

Thanks in advance