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Important Questions

Compound Interest (Using Formula) — Important Questions

ICSE · Class 9 · Mathematics

37 important questions from Compound Interest (Using Formula) for ICSE Class 9 Mathematics, with answers. Part of the ICSE Class 9 Mathematics syllabus.

37 questions25 flashcards4 formulas & key relations5 concepts

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A labeled diagram explaining the components of the compound interest formula A = P(1 + r/100)^n when interest is compounded yearly.
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37 Questions·
multiple choicemultiple correct

Important Questions from Compound Interest (Using Formula)

1multiple correct

Which of the following are components of the compound interest formula A = P(1 + r/100)ⁿ?

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A represents Amount, P represents Principal, r represents rate per annum, n represents number of years

In the formula A = P(1 + r/100)ⁿ: A is Amount, P is Principal, r is rate per annum, and n is number of years (not months).

2multiple correct

Which statements are true about compound interest?

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The amount is given by A = P(1 + r/100)^n when interest is compounded yearly., For half-yearly compounding, the rate is divided by 2 and the number of years is multiplied by 2., For quarterly compounding, the rate is divided by 4 and the number of years is multiplied by 4., When the rates for succes

Compound interest uses a formula for yearly compounding, and the chapter also gives special forms for half-yearly and quarterly compounding. It further states that when successive yearly rates are different, the amount is found by multiplying the factors for each year. All four statements match these rules.

3multiple choice

In how many years will ₹1,600 amount to ₹1,944 at 10% compound interest?

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2 years

1944 = 1600(1.1)ⁿ → (1.1)ⁿ = 1.215 → (1.1)ⁿ = (1.1)² → n = 2 years

4multiple choice

What is the difference between CI and SI on ₹2,000 for 2 years at 5% per annum?

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₹5

CI = 2000[(1.05)² - 1] = 2000[1.1025 - 1] = ₹205. SI = (2000 × 5 × 2)/100 = ₹200. Difference = 205 - 200 = ₹5

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What are the important topics in Compound Interest (Using Formula) for ICSE Class 9 Mathematics?
Key topics in Compound Interest (Using Formula) include Core idea and direct formula, Amount when rates are different in successive years, Finding principal, rate, and time, Age and sharing problems. Study these first, then practise questions on each for Class 9 exams.
How many important questions are there in Compound Interest (Using Formula)?
Super Tutor has 37 practice questions for Compound Interest (Using Formula), including multiple choice, multiple correct questions. A sample with answers is on this page.

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