Practice Questions
Concept Explanation
Simple Interest (SI) is calculated only on the original principal for the entire period. Interest does not earn further interest.
Key Formula
SI = (P × R × T) / 100
- P = Principal (initial sum)
- R = Rate of interest per annum (%)
- T = Time in years
Amount
Amount (A) = P + SI
Example
Find SI on Rs. 5,000 at 10% per annum for 2 years.
SI = (5000 × 10 × 2) / 100 = Rs. 1,000. Amount = Rs. 6,000.
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Q1 Easy
What is the simple interest on Rs. 5,000 at 10% per annum for 2 years?
ExplanationSI = (5000 × 10 × 2)/100 = Rs. 1,000. -
Q2 Easy
Simple interest on Rs. 8,000 at 5% for 4 years is:
ExplanationSI = (8000 × 5 × 4)/100 = Rs. 1,600. -
Q3 Easy
Find SI on Rs. 12,000 at 6% for 2 years.
ExplanationSI = (12000 × 6 × 2)/100 = Rs. 1,440. -
Q4 Medium
SI on Rs. 6,000 at 8% for 5 years equals:
ExplanationSI = (6000 × 8 × 5)/100 = Rs. 2,400. -
Q5 Easy
What is SI on Rs. 10,000 at 12% for 1 year?
ExplanationSI = (10000 × 12 × 1)/100 = Rs. 1,200. -
Q6 Easy
SI on Rs. 7,500 at 4% for 3 years is:
ExplanationSI = (7500 × 4 × 3)/100 = Rs. 900. -
Q7 Medium
Find SI on Rs. 15,000 at 8% for 2.5 years.
ExplanationSI = (15000 × 8 × 2.5)/100 = Rs. 3,000.
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Q8 Easy
If P = Rs. 2,000, R = 15%, T = 2 years, SI is:
ExplanationSI = (2000 × 15 × 2)/100 = Rs. 600. -
Q9 Medium
SI on Rs. 25,000 at 6% for 4 years is:
ExplanationSI = (25000 × 6 × 4)/100 = Rs. 6,000. -
Q10 Medium
Simple interest on Rs. 9,000 at 10% for 1.5 years is:
ExplanationSI = (9000 × 10 × 1.5)/100 = Rs. 1,350. -
Q11 Medium
P = Rs. 4,000, SI = Rs. 960, R = 8%. Time in years is:
ExplanationT = (100 × SI)/(P × R) = 96000/32000 = 3 years. -
Q12 Easy
Which formula gives simple interest?
ExplanationSimple interest uses SI = (P × R × T)/100. -
Q13 Hard
At 10% simple interest, in how many years does SI equal the principal?
ExplanationWhen SI = P, RT/100 = 1, so T = 100/R = 10 years. -
Q14 Easy
SI on Rs. 18,000 at 5% for 3 years is:
ExplanationSI = (18000 × 5 × 3)/100 = Rs. 2,700.
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DS1 Easy
What is the simple interest?
Statement IPrincipal is Rs. 5,000 and rate is 10% per annum.
Statement IITime is 2 years.
ExplanationNeed P, R and T together. SI = Rs. 1,000. -
DS2 Easy
What is the simple interest?
Statement IPrincipal is Rs. 8,000 at 5% for 4 years.
Statement IIThe amount after 4 years is Rs. 9,600.
ExplanationStatement I alone gives SI = Rs. 1,600.
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DS3 Medium
Is the simple interest greater than Rs. 1,000?
Statement IPrincipal is Rs. 6,000 at 8% for 2 years.
Statement IITime is less than 3 years.
ExplanationStatement I: SI = Rs. 960, which is not greater than Rs. 1,000. -
DS4 Easy
What is the amount?
Statement IPrincipal is Rs. 10,000 at 12% per annum.
Statement IITime is 2 years.
ExplanationTogether: SI = Rs. 2,400 and amount = Rs. 12,400.