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A sum of money at a certain rate per ann...

A sum of money at a certain rate per annum of simple interset doubles in the 5 years and at a difference rate becomes three times in 12 years. The lowe rate of interset pre annum is

A

`2%`

B

`3%`

C

`3(1)/(3)%`

D

`4(1)/(3)%`

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