Answer:
the saving company have is: 24  *$1.25 = 30
  *$1.25 = 30 
Step-by-step explanation:
I think your question is missed of key information, allow me to add in and hope it will fit the original one.  Please have a look at the attached photo. 
My answer: 
We need to caculate the surface areas of 
Box 1 = 2lw+2lh+2hw = 2*20*4 + 2*20*6 + 2*6*4 = 448  
 
Box 2 = 2lw+2lh+2hw = 2*15*8 + 2*15*4 + 2*4*8 = 424 
 
So the differences in surface areas of the two boxes is:
448  - 424
  - 424 
 
= 24  
  
So the saving company have is: 24  *$1.25 = 30
  *$1.25 = 30 
Hope it will find you well.