at what rate percent per annum will a sum of money double in 9 years.	Choose the correct choice from the following:
A) 12.5 %
B) 13.5 %
C) 11.5 %
D) 11.1 %
E) 21.5 %
<gadget id="calculator">100 / 9</gadget>
<output>100/9 = around 11.111111</output>

<result>D</result>
at what rate percent per annum will a sum of money double in 9 years.
divide(const_100, 9)
"let principal = p , then , s . i . = p and time = 8 years rate = [ ( 100 x p ) / ( p x 9 ) ] % = 11.1 % per annum . answer : d"