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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:

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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: Answer: Rs. 5000

Let the investment in 9% stock be Rs. x. Then, investment in 10% stock = Rs. (9800 - x). 9/75 x x = 10/80 x (9800 - x) ⇒ 3x/25 = 9800 - x/8 ⇒ 24x = 9800 x 25 - 25x ⇒ 49x = 9800 x 25 ⇒ x = 5000.

Question context

This question is part of 📏 Arithmetic Aptitude within the broader 🧠 Aptitude Mastery subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.