A certain sum amounts to Rs.1600 in 4 years and Rs.1900 in 7 years. Find the rate % per annum?	Choose the correct choice from the following answers:
A) 9.33%	B) 7.33%	C) 5.33%	D) 8.33%	E) 6.33%
4 --- 1600   7 --- 1900   --------------   3 --- 300   N = 1 I = 100 R = ?   P = 1600 - 400= 
<gadget id="calculator">1600 - 400</gadget>
<output>1_200</output>
1200   100= (1200*1*R)/100   R = 8.33%   Answer: 8.33%
<result>D</result>
A certain sum amounts to Rs.1600 in 4 years and Rs.1900 in 7 years. Find the rate % per annum?