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If a sum of money becomes 4000 in 2 year...

If a sum of money becomes 4000 in 2 year and 5500 in 4 year 6 month at the same rate of simple interest per annum. Then the rate of simple interest is :

A

`21 2/7%`

B

`21 3/7%`

C

`21 1/7%`

D

`21 5/7%`

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