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किंतने समय मे रुपए 1000 की राशि 20 % वार्षिक की दर से 1331 हो जायगी, जबकि ब्याज प्रति छमाही सयोजिता होता है |A. `1(1)/(2)"years"`B. 2 yearsC. 1 yearsD. `2(1)/(2)"years"` |
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Answer» Correct Answer - a (a) Principal (P) = Rs. 1000, Amount (A) = RS. 1331, Let Required time = t years According to the question, Note : When interest is compounded half -yearly . () `Rate% = (20)/(2)= 10%` Time = 2t years By using formula, `1331= 1000(1+(10)/(100))^(2t)` `(1331)/(1000)= ((11)/(10))^(2t)` `((11)/(10))^(3)=((11)/(10))^(2t)` By equating both sides () `2t= 3 rArr t = (3)/(2)"years"` `t= 1(1)/(2)"years"` |
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