Braun invested a certain sum of money at 8% p.a. simple interest for 'n' years. At the end of 'n' years, Braun got back 5 times his original investment. What is the value of n?	Options:
A) 50 years
B) 25 years
C) 12 years 6 months
D) 37 years 6 months
E) 40 years
Explanatory Answer   Let us say Braun invested $100.   Then, at the end of 'n' years he would have got back $500.   Therefore, the Simple Interest earned = 500 - 100= 
<gadget id="calculator">500 - 100</gadget>
<output>400</output>
$400.   We know that Simple Interest= (Principal * number of years * rate of interest) / 100   Substituting the values in the above equation we get 400 = (100 * n * 8) / 100   Or 8n = 400   Or n = 50 years.   correct choice is (50 years)
<result>A</result>
Braun invested a certain sum of money at 8% p.a. simple interest for 'n' years. At the end of 'n' years, Braun got back 5 times his original investment. What is the value of n?