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What is the correct answer?
4
Rs. 9800 are invested partly in 9% stock at 75 and 10% stock at 80 to have equal amount of incomes. The investment in 9% stock is
A.
Rs. 4800
B.
Rs. 5000
C.
Rs. 5400
D.
Rs. 5600
Correct Answer :
B. Rs. 5000
Let the investment in 9% stock be Rs. x.
Then, investment in 10% stock = Rs. (9800 - x).
9
75
×
x
=
10
80
×
(
9800
-
x
)
⇒
3
x
25
=
9800
-
x
8
⇒
24x = 9800 x 25 - 25x
⇒
49x = 9800 x 25
⇒
x = 5000.
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