100
I got the answer by 26 divided by 0.26
 
        
             
        
        
        
Answer:

Step-by-step explanation:
The distance between point (x1,y1) and (x2,y2) on a coordinate plane is given by expression 
In the problem given coordinate points are 
 (0, a) and (a, 0). 
Thus, distance between these points are given by

Thus , expression  gives the distance between point (0, a) and point (a, 0) on a coordinate grid.
 gives the distance between point (0, a) and point (a, 0) on a coordinate grid.
 
        
                    
             
        
        
        
Step-by-step explanation:
if 900 is increased by 20% then
120/100×900=1080
Decreasing it by 20% then
80/100×1080=864
 
        
             
        
        
        
Answer:
around 6 and a half pounds