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2016-03-31T06:58:32+05:30

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Solution


Income from $ 4000 at 5 % in one year = $ 4000 of 5 %.


= $ 4000 × 5/100.


= $ 4000 × 0.05.


= $ 200.


Income from $ 3500 at 4 % in one year = $ 3500 of 4 %.


= $ 3500 × 4/100.


= $ 3500 × 0.04.


= $ 140.


Total income from 4000 at 5 % and 3500 at 4 % = $ 200 + $ 140 = $ 340.


Remaining income amount in order to have a yearly income of $ 500 = $ 500 - $ 340.


= $ 160.


Total invested amount = $ 4000 + $ 3500 = $7500.


Remaining invest amount = $ 10000 - $ 7500 = $ 2500
.

We know that, Interest = Principal × Rate × Time


Interest = $ 160,


Principal = $ 2500, 


Rate = r [we need to find the value of r],


Time = 1 year.


160 = 2500 × r × 1.


160 = 2500r


160/2500 = 2500r/2500 [divide both sides by 2500]


0.064 = r


r = 0.064


Change it to a percent by moving the decimal to the right two places r = 6.4 %


Therefore, he invested the remaining amount $ 2500 at 6.4 % in order to get $ 500 income every year.


Answer: (e)
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