AP Police Constable previous year question
The rate of simple interest per annum to be taken, so that an amount becomes four times its principal in 21 years, is:
Asked in AP Police Constable Prelims: 2016 (06 Nov 2016) · Quantitative Aptitude
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Correct answer: (A) 14 2/7 %
Given: Amount = 4 × Principal (P), Time = 21 years. Formula: SI = (P × R × T)/100. Calculation: SI = Amount − Principal = 4P − P = 3P. So 3P = (P × R × 21)/100 ⇒ R = 300/21 = 100/7 % = 14 2/7 %.
हिंदी में प्रश्न
ఒక అసలు మొత్తం 21 సంవత్సరాలలో నాలుగు రెట్లు అయ్యేందుకు తీసుకోవలసిన వార్షిక సాధారణ వడ్డీ రేటు ఎంత?
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सही उत्तर: (A) 14 2/7 %
ఇవ్వబడినవి: మొత్తం (అమౌంట్) = 4 × అసలు (P), కాలం = 21 సంవత్సరాలు. సూత్రం: సాధారణ వడ్డీ = (P×R×T)/100. లెక్క: వడ్డీ = మొత్తం − అసలు = 4P − P = 3P. కాబట్టి 3P = (P×R×21)/100 ⇒ R = 300/21 = 100/7 % = 14 2/7 %.
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