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Divide Rs. 50,760 into two parts such that if one part is invested in 8% Rs. 100 shares at 8% discount and the other in 9% Rs. 100 shares at 8% premium - Mathematics

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Question

Divide Rs. 50,760 into two parts such that if one part is invested in 8% Rs. 100 shares at 8% discount and the other in 9% Rs. 100 shares at 8% premium, the annual incomes from both the investments are equal.

Sum

Solution

Total investment = Rs. 50,760

Let 1st part = Rs. y

2nd part = Rs. (50,760 – y)

For 1st part:

Nominal value of 1 share = Rs. 100

Market value of 1 share = Rs. 100 – 8% of Rs. 100

= Rs. 100 – Rs. 8

= Rs. 92

∴ No. shares purached = `y/92` shares

Dividend% = 8%

Dividend on 1 share = 8% of Rs. 100 = Rs. 8

Total dividend = `y/92 xx Rs. 8 = Rs. (2y)/23`

For 2nd part:

Nominal value of 1 share = Rs. 100

Market value of 1 share = Rs. 100 + 8% of Rs. 100

= Rs. 100 + Rs. 8

= Rs. 108

∴ No of shares purchased = `(50760 - y)/108` shares

Dividend% = 9%

Dividend on 1 share = 9% of Rs. 100 = Rs. 9

Total dividend = `(50760 - y)/108 xx Rs. 9`

= `Rs. (9(50760 - y))/108`

Given that both dividend are equal

Then `Rs. (2y)/23 = Rs. (9(50760 - y))/108`

`=> 2y xx 108  = 23(456840 - 9y)`

`=> 216y  = 456840 xx 23 - 207y`

`=> 423y = 456840 xx 23`

`=> y= (456840 xx 23)/423 = Rs. 24,840`

1st part = Rs. 24,840

2nd part = Rs. 50,760 – Rs. 24,840 = Rs. 25,920

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Chapter 3: Shares and Dividend - Exercise 3 (C) [Page 38]

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Selina Mathematics [English] Class 10 ICSE
Chapter 3 Shares and Dividend
Exercise 3 (C) | Q 13 | Page 38

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