Answer:
10%
0.10
1/10
Step-by-step explanation:
100% = 10/10
when you subtract 9/10 from 10/10 you get 1/10=10%
 
        
             
        
        
        
so 24cm out of 300 cm is spliced
24/300 is the fraction
we can simplify this by dividing top and bottom by 3 to get
8/100
we can divide top and bottom by 4 to get
2/25 is the most simplified fraction
 
        
             
        
        
        
So you have to plug in the amount to the cost making you problem look like this:
0.85(30)+2.5(2)
25.5+5=30.5
        
             
        
        
        
Assume E represents the cost of an egg and T represents the cost of one piece of toast. 
We can construct two equations :
2E + T = $3.00 - - - - - (a) 
E + T = $1.80 - - - - - (b) 
Subtract equation b from a:
E = $1.20 (The price of one egg) 
To find out the price of one piece of toast, replace the price of one egg in equation b:
T = $1.80 - $1.20 = $0.60 (The price of one piece of toast) 
Hope that helps you