erest, a sum becomes in 2 At simple interest, a sum bec 3 times in 20 yr. Find the tim which the sum will be double at the same rate of interest. (1) 8 yr (2) 10 yr (3) 12 yr (4) 14 yr

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3. (2) Let the principal ( =x ) Then, the amount ( =3 x ) ( T=10 mathrm{yr} )

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