 
 <prompt> ```
One book dey cost $4 pass CD. CD dey 30% cheaper pass $20 album. How much book dey cost?``` <response>: ```The CD na 30/100 * 20 = $6 cheaper pass the album.
So the cost of the CD na 20 - 6 = $14.
The book na $4 more expensive pass the CD, which means e cost 14 + 4 = $18.

The answer go be 18.``` 