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Tamil Nadu Board of Secondary EducationHSC Commerce Class 11

A man invests ₹ 13,500 partly in 6% of ₹ 100 shares at ₹ 140 and the remaining in 5% of ₹ 100 shares at ₹ 125. If his total income is ₹ 560, how much has he invested in each? - Business Mathematics and Statistics

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Question

A man invests ₹ 13,500 partly in 6% of ₹ 100 shares at ₹ 140 and the remaining in 5% of ₹ 100 shares at ₹ 125. If his total income is ₹ 560, how much has he invested in each?

Sum

Solution

Let the amount invested in 6% of ₹ 100 shares at ₹ 140 be x.

Then the amount invested in 5% of ₹ 100 shares at ₹ 125 is ₹ 13500 – x.

Income from 6% shares = Number of shares × Face value of a share × Rate of dividend

= `"x"/140 xx 100 xx 6/100`

= `(3"x")/70`

Income from 5% shares = Number of shares × Face value of a share × Rate of dividend

= `(13500 - "x")/125 xx 100 xx 5/100`

= `(13500 - "x")/25`

Given that the total income = ₹ 560

`(3"x")/70 + (13500 - "x")/25` = 560

`((3"x") xx 5 + (13500 - "x") xx 14)/350` = 560

`(15"x" + 13500 xx 14 - 14"x")/350` = 560

x + 13500 × 14 = 560 × 350

x = 196000 – 189000 = 7000

Amount invested at 6% stock = ₹ 7,000

Amount invested at 5% stock = ₹ 13500 – ₹ 7000 = ₹ 6500

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Chapter 7: Financial Mathematics - Exercise 7.2 [Page 171]

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Samacheer Kalvi Business Mathematics and Statistics [English] Class 11 TN Board
Chapter 7 Financial Mathematics
Exercise 7.2 | Q 7 | Page 171

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