A lent Rs. 5000 to B for 2 years and Rs. 3000 to C for 4 years on simple interest at the same rate of interest and received Rs. 2200 in all from both of them as interest. The rate of interest per annum is:	Choose the correct answer
A) 5%  B) 10%  C) 7%  D) 8%  E) 9%
Explanation :   Let the rate of interest per annum be R%   Simple Interest for Rs. 5000 for 2 years at rate R% per annum +Simple Interest for Rs. 3000 for 4 years at rate R% per annum = Rs.2200   ⇒5000×R×2/100+3000×R×4/100=2200   ⇒100R + 120R=2200   ⇒220R=2200   ⇒R=10   i.e, Rate = 10%.   Answer : Option 10%
<result>B</result>
A lent Rs. 5000 to B for 2 years and Rs. 3000 to C for 4 years on simple interest at the same rate of interest and received Rs. 2200 in all from both of them as interest. The rate of interest per annum is: