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TCS NQT GuideTCS NQT Numerical AbilitySimple Interest and Compound Interest (SI-CI) Tricky Questions

Simple Interest and Compound Interest (SI-CI) Tricky Questions

Learn core concepts, essential formulas, and attempt practice questions designed on the latest TCS NQT testing patterns.

Key Concepts & Formulas

  • 1Simple Interest (SI) = (P * R * T) / 100.
  • 2Compound Interest Amount (A) = P * (1 + R/100)^T.
  • 3CI = Amount - Principal.
  • 4Difference between CI and SI for 2 years = P * (R / 100)^2.
  • 5Difference between CI and SI for 3 years = P * (R / 100)^2 * (3 + R/100).

TCS NQT Style Practice Questions

Practice Question 1

The difference between SI and CI on a sum for 2 years at 10% per annum is Rs. 50. Find the principal.

A) Rs. 5000
B) Rs. 2500
C) Rs. 10000
D) Rs. 7500

Correct Answer: A) Rs. 5000

Step-by-step Solution: Difference = P * (R/100)^2. => 50 = P * (10/100)^2 => 50 = P * 0.01 => P = 50 / 0.01 = 5000.

Practice Question 2

In how many years will a sum of money double itself at 12.5% Simple Interest per annum?

A) 8 years
B) 6 years
C) 10 years
D) 12 years

Correct Answer: A) 8 years

Step-by-step Solution: For a sum to double, the SI must equal the Principal (P). SI = P * R * T / 100 => P = P * 12.5 * T / 100 => T = 100 / 12.5 = 8 years.

Study Pro-Tip

For difference questions, utilize the 2-year and 3-year SI-CI difference shortcut formulas directly.

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