6*5= 30 fingers, so tim would say there are 30 fingers.
An expression of more than 2 terms
First of all, we need to deduce the price of a single camera:
![\dfrac{1800}{12}=150](https://tex.z-dn.net/?f=%5Cdfrac%7B1800%7D%7B12%7D%3D150)
Now, we know that he profits 36 dollars from each camera. So, we are asking: which percentage of 150 is 36? We have
![36 = 150\cdot\dfrac{x}{100}](https://tex.z-dn.net/?f=36%20%3D%20150%5Ccdot%5Cdfrac%7Bx%7D%7B100%7D)
This equation literally says: 36 is x-percent of 150. And we need to solve for x:
![x=\dfrac{36\cdot 100}{150} =24](https://tex.z-dn.net/?f=x%3D%5Cdfrac%7B36%5Ccdot%20100%7D%7B150%7D%20%3D24)