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ICSE Class 10 Answered

Suhavi has a recurring deposit account I a bank of rs 800 per month at the rate of 11% pa .  she gets rs 61420 at the time of maturity,find the total time for which the account was held.  
Asked by suhavi.thukral123 | 16 Oct, 2018, 07:57: PM
answered-by-expert Expert Answer
begin mathsize 18px style let space straight x space be space the space number space of space months so comma 800 straight x plus 800 cross times fraction numerator straight x open parentheses straight x plus 1 close parentheses over denominator 2 cross times 12 end fraction cross times 11 over 100 equals 61420 800 straight x plus 11 over 3 open parentheses straight x squared plus straight x close parentheses equals 61420 2400 straight x plus 11 straight x squared plus 11 straight x equals 184260 11 straight x squared plus 2411 straight x minus 184260 equals 0 solve space the space above space equation space left parenthesis formula space method right parenthesis straight x equals 60 space months end style
Answered by Arun | 17 Oct, 2018, 10:22: AM

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ICSE 10 - Maths
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