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 6 times his original investment. What is the value of n?  Choose the correct answer.
A) 50 years	B) 25 years	C) 62 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 $600.   Therefore, the Simple Interest earned = 600 - 100= 
<gadget id="calculator">600 - 100</gadget>
<output>500</output>
$500.   We know that Simple Interest= (Principal * number of years * rate of interest) / 100   Substituting the values in the above equation we get 500 = (100 * n * 8) / 100   Or 8n = 500   Or n = 62.5 years.   correct choice is (62 years 6 months)
<result>C</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 6 times his original investment. What is the value of n?