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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?
Options:
A .  5%
B .  7%
C .  7 1/8 %
D .  10%
Answer: Option D


Let the rate be R% p.a. Then,(5000 * R * 2)/100 + (3000 * R * 4)/100 = 2200100 R + 120 R = 2200R = 10%



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