1.

1). Rs. 3160 2). Rs. 4120 3). Rs. 3972 4). Rs. 6254

Answer»

Let the rate of INTEREST be r%

Simple interest = (PRINCIPAL × rate × time)/100 = (principal × r × 6)/100

Now,

Amount = principal + simple interest

Principal + 60% of principal = principal + {(principal × r × 6)/100}

⇒ 1.6 = 1 + 0.06r

⇒ 0.6 = 0.06r

⇒ r = 10%

Now,

COMPOUNDED Amount = principal {1 + (rate/100)}time = 12000{1 + (10/100)}3 = 12000 × 1.1 × 1.1 × 1.1 = 15972

∴ Interest = Amount – principal = 15972 – 12000 = Rs. 3972



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