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9.In what time will the simple interest on a certain sum be three-fourth of the principal at 6% per annum |
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Answer» Step-by-step explanation:Solution :- Let the principal amount be Rs. 100 Simple interest should be three FOURTH (3/4th) of the principal. So, the simple interest = (100*3)/4 = Rs. 75 So, P = Rs. 100 ; RATE of Interest = 6 % Time = ? Simple Interest = Rs. 75 Simple Interest = (P*R*T)/100 ⇒ 75 = (100*6*T)/100 ⇒ 75*100 = 600T ⇒ T = 7500/600 ⇒ T = 25/2 or 12 years and 6 MONTHS So, in 12 years and 6 months the simple interest on a certain principal will be three-fourth of that principal 6 % per annum. |
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