Yuki bought a pound of confetti for $12. what is the price, in dollars, per ounce of confetti? there are 16 ounces in 1 pound.

For this case we can solve the problem by applying the following rule of three:
 16 ounces > 12 $
 1 ounces > x
 Clearing x we have:
 x = (1/16) * (12)
 x = 0.75 $ / ounce
 
 The price, in dollars, per ounce of confetti is:
 x = 0.75 $ / ounce