1c:I[1254,["7330","static/chunks/d3ac728e-78c3d5d7a486ed3a.js","5159","static/chunks/5159-48592f0bf1a47f9d.js","8175","static/chunks/8175-f84d59b9bd013e10.js","8167","static/chunks/8167-b25693a0140130f2.js","664","static/chunks/664-bceb0f356f9312eb.js","3703","static/chunks/app/practice-question/%5Bslug%5D/page-d1408559b663b83f.js"],"PracticeQuestionCard"] 1b:T4e0,{"@context":"https://schema.org","@type":"QAPage","name":"A sum of money placed at compound interest doubles itself in 4 years.…","url":"https://vidyalelo.com/practice-question/a-sum-of-money-placed-at-compound-interest-doubles-itself-in-4-years-in-how-many-years-will-it-amount-to-8-times-53","keywords":"practice questions, MCQ, MCQs with answers, objective questions, competitive exam questions, Competitive Exams, Competitive Exams MCQ, Competitive Exams MCQs, Competitive Exams questions, Competitive Exams practice questions, Aptitude, Aptitude MCQ, Aptitude MCQs, Aptitude questions, Aptitude practice questions, Interest","mainEntity":{"@type":"Question","name":"A sum of money placed at compound interest doubles itself in 4 years.…","text":"A sum of money placed at compound interest doubles itself in 4 years. In how many years will it amount to 8 times?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Option D. 12 years. Answer & Solution Answer: Option D Solution: & Let, & Principal = Rs.\\,100 & Amount = Rs.\\,200 & Rate = r\\% & Time = 4\\, years & Now, & A = P × [ 1 + ( r100 ) ]^n & 200 = 100 × [ 1 + ( r100 ) ]^4 & 2 = [ 1 + ( r100 ) ]^4 - - - - - - ( i ) & If\\, sum\\, become\\, 8\\, times\\, in\\, t…"}}}1d:T6d0,

Answer & Solution

Answer: Option D

Solution:

$$\eqalign{ & {\text{Let}}, \cr & {\text{Principal}} = Rs.\,