Which of the following represents the profit from the investment of x dollars at n percent compound annual interest for 7 years?  Choose the most appropriate option
A) 4x (1+n/100)^6 - x  B) 5x (1+n/100)^5- x  C) 3x (1+n/100)^4 - x  D) x (1+n/100)^4 - x  E) x (1+n/100)^7 - x
Amount after 7 years compounded yearly = x (1+n/100)^7   Thus profit = Final amount - original principle = x (1+n/100)^7 - x . Answer : x (1+n/100)^7 - x
<result>E</result>
Which of the following represents the profit from the investment of x dollars at n percent compound annual interest for 7 years?