Question:hard

M and N start a business with respective capitals of Rs. 35,000 and Rs. 22,000. M withdrew an amount of Rs. 1000 every month from the business while N put in an additional amount of Rs. 1,000 every month into the business. If they close the business after 13 months after making a profit of Rs. 85,500, then what is the share of N?

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Use capital multiplied by number of months for each partner to find the profit-sharing ratio.
Updated On: Jul 21, 2026
  • Rs. 22,500
  • Rs. 33,000
  • Rs. 43,500
  • Rs. 46,000
Show Solution

The Correct Option is C

Solution and Explanation

This can be solved faster using the fact that M's and N's monthly capitals always add up to the same constant amount.
Step 1: Notice the constant combined capital. In any given month, M's capital plus N's capital is \((35000 - 1000k) + (22000 + 1000k) = 57000\), which does not depend on the month number k at all.
Step 2: Find the combined capital-months. Since the combined capital is Rs. 57,000 every single month for 13 months, the combined total is \(13 \times 57000 = 741000\).
Step 3: Find N's capital-months directly. N's monthly capital forms an arithmetic series from 23,000 to 35,000 over 13 months, so N's total is \(13 \times \dfrac{23000+35000}{2} = 377000\).
Step 4: Find M's capital-months by subtraction. M's total = combined total minus N's total = \(741000 - 377000 = 364000\), without recomputing M's series separately.
Step 5: Form the ratio and divide the profit. M : N = 364000 : 377000 = 28 : 29. N's share = \(\dfrac{29}{57} \times 85500 = 43500\), the same as before.\[\boxed{\text{Rs. }43{,}500}\]
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