If his income from both is equal, amount invested on first stock was
Ravi invested Rs. 913 partly in 4% stock at Rs. 97 and partly in 5% stock at Rs.107. If his income from both is equal, amount invested on first stock was.
ARs. 750
BRs. 525
CRs. 610
DRs. 485
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Correct Answer is : 485
Let he invests x in 4% stock and y in 5% stock
On 97 he earns Rs.4.
On x he earns \(4x \over 97 \)
Similarly on y he will earns \(5y \over 107 \)
\(4x \over 97\) = \(5y \over 107 \)
x = \(485y \over 428 \)
x + y = 913
Substituting the value of x we get y = 428
First installment = 485
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