Answer:
≈12.53
Step-by-step explanation:
 
        
             
        
        
        
The annual returns will be calculated as follows:
a] Here we use the formula:
A=p(1+r/100)^n
A=future amount
p=principle
r=returns
n=time
We are given:
A=500, p=400, t=1
Plugging the values in the formula we obtain:
500=400(1+r)^1
simplifying and solving for r:
1.25=1+r
thus
r=1.25-1
r=0.25~25%
b] Using the formula above:
A=p(1+r/100)^n
A=2500+100=2600, p=2000, n=1 year
plugging the values in the equation we obtain:
2600=2000(1+r)^1
simplifying and solving for r we obtain:
2600/2000=1+r
1.3=1+r
hence
r=1.3-1
r=0.3~30%
        
             
        
        
        
Answer:
Is it any of the rational numbers?  There are an infinite number of rational numbers.  Rational numbers are any numbers that can be written as a fraction.  All the integers between those two points (-2, -1, 0, etc.) are all rational.  Any of the numbers between the points would be too. 1/2, 1/3, 2 1/3, etc.
Step-by-step explanation:
 
        
                    
             
        
        
        
The answer is the third option