Answer:
Decimal : 2.4
Fraction: 2 4/10 or 2 2/5
Step-by-step explanation:
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Average rate of change is defined by (y^-y)/(t^-t) where the ^ means the final(so final y and final t)
So you'd do (8.75-2.75)/(12-4) which is 6/8 which is 3/4 of a dollar per week
        
             
        
        
        
Step-by-step explanation:
Simple interest is a method to calculate the amount of interest charged on a sum at a given rate and for a given period of time.
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Simple Interest Example:
Simple Interest
1 Year	S.I = (1000 ×5 × 1)/100 = 50
2 Year	S.I = (1000 × 5 × 2)/100 = 100
3 Year	S.I = (1000 ×5 × 3)/100 = 150