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30 , 000 रुपये की राशि पर 7 % वार्षिक दर से निश्चित समय के लिए चक्रवृद्धि ब्याज 4 , 347 रुपये है | वह समय है -A. 3 yearsB. 13 yearsC. 8 yearsD. 2.5 years |
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Answer» Correct Answer - c (c) Principal =Rs. 30,000 CI= Rs. 4347, By using fromula, `rArr (30,000 + 4347)= 30,00(1+(7)/(100))^(t)` `34347 = 30,000(1+(7)/(100))^(t)` `rArr (34347)/(30,000)=((107)/(100))^(t)` `rArr (11449)/(10000)= ((107)/(100))^(t)` `((107)/(100))^(2)= ((107)/(100))^(t)` `rArr t = 2 "years"` |
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