1.

If a sum of money becomes Rs. 4000in 2 years and Rs. 5500 in 4 years 6 months at the same rate of simple interest per annum. Then the rate of simple interest is=?

A. ${\text{21}}\frac{3}{7}$$ %
B. ${\text{21}}\frac{2}{7}$$ %
C. ${\text{21}}\frac{1}{7}$$ %
D. ${\text{21}}\frac{5}{7}$$ %
Answer» B. ${\text{21}}\frac{2}{7}$$ %


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