A man lends Tk 10000 in four parts. If he gets 8% on tk 2000, 7.5% on Tk 4000 and 8.5% on Tk 1400, what percent must he get for the remainder, if the average interest is 8.13%?

9.25

10.5

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উত্তর: 9

Total interest পেতে হবে = 10000×8.13/100 = 813 টাকা। এখন পর্যন্ত ( 2000 + 4000 + 1400) বা, 7400 টাকায় মোট interest = 2000×0.8 + 4000×0.75 + 1400×0.085 = 160 + 300 + 119 = 579 টাকা তাহলে, টাকা পাওয়া বাকি ( 10000 - 7400) = 2600 , interest বাকি = 813 - 579 = 234 তাহলে, 2600 এর x% = 234 হলে x = (234×100)/2600 = 9%

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A man lends Tk 10000 in four parts. If he gets 8% on tk 2000, 7.5% on Tk 4000 and 8.5% on Tk 1400, what percent must he get for the remainder, if the average interest is 8.13%?

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