Find the rate of interest per annum ?

I. The CI in 12 years is more than the amount.

II. The difference between SI and CI in 3 years is Rs.1200

III. An amount double itself at SI in 20 years

From III : Principal = P, Amount = 2P Interest = 2P – P = P SI =P = P × R × 20/100 R = 5%

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