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The simple interest on a sum of money number of years is equal to the rate per annum. The rate of annum is:(किसी राशि का साधारण बियाज मूलधन का 4 /9 है यदि दिए गए धन पर बियाज की वार्षिक दर तथा समय सम्म्मान हो तो बियाज दर किया होगी )
A. 0.05
B. `6(2)/(3)`
C. 0.06
D. `7(1)/(5)`

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(b) Let the principal(माना की मूलधन)=9units Hence second interest(साधारण बियाज)=(4)/(9)xx9=4units
Let, Rate of interest(बियाज दर)=R%
R=T(Given)
By using formula,
`SI=(PxxRxxT)/(100)`
`4=(9xxRxxR)/(100) Rightarrow R^(2)=(400)/(9)`
`R=(20)/(3)=6(2)/(3)%`

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