Practice Questions
Concept Explanation
When principal, simple interest, and time are known, find the rate using the rearranged SI formula.
Key Formula
R = (100 × SI) / (P × T)
Example
P = Rs. 5,000, SI = Rs. 1,000, T = 2 years. R = (100 × 1000)/(5000 × 2) = 10%.
-
Q1 Easy
P = Rs. 5,000, SI = Rs. 1,000, T = 2 years. Rate is:
ExplanationR = 100000/(5000×2) = 10%. -
Q2 Easy
P = Rs. 8,000, SI = Rs. 960, T = 3 years. Rate is:
ExplanationR = 96000/24000 = 4%. -
Q3 Easy
P = Rs. 10,000, SI = Rs. 1,500, T = 3 years. Rate is:
ExplanationR = 150000/30000 = 5%. -
Q4 Medium
P = Rs. 6,000, SI = Rs. 1,080, T = 3 years. Rate is:
ExplanationR = 108000/18000 = 6%. -
Q5 Medium
P = Rs. 12,000, SI = Rs. 3,600, T = 3 years. Rate is:
ExplanationR = 360000/36000 = 10%. -
Q6 Easy
P = Rs. 4,000, SI = Rs. 480, T = 3 years. Rate is:
ExplanationR = 48000/12000 = 4%. -
Q7 Medium
P = Rs. 7,500, SI = Rs. 2,250, T = 6 years. Rate is:
ExplanationR = 225000/45000 = 5%.
-
Q8 Hard
P = Rs. 9,000, SI = Rs. 1,350, T = 2.5 years. Rate is:
ExplanationR = 135000/22500 = 6%. -
Q9 Hard
P = Rs. 20,000, SI = Rs. 5,000, T = 2 years. Rate is:
ExplanationR = 500000/40000 = 12.5%. -
Q10 Medium
P = Rs. 15,000, SI = Rs. 4,500, T = 2 years. Rate is:
ExplanationR = 450000/30000 = 15%. -
Q11 Easy
P = Rs. 10,000, SI = Rs. 400, T = 2 years. Rate is:
ExplanationR = 40000/20000 = 2%. -
Q12 Medium
P = Rs. 5,000, SI = Rs. 750, T = 1.5 years. Rate is:
ExplanationR = 75000/7500 = 10%. -
Q13 Hard
P = Rs. 16,000, SI = Rs. 3,200, T = 2.5 years. Rate is:
ExplanationR = 320000/40000 = 8%. -
Q14 Easy
P = Rs. 12,000, SI = Rs. 2,400, T = 4 years. Rate is:
ExplanationR = 240000/48000 = 5%.
-
DS1 Easy
What is the rate of interest?
Statement IPrincipal is Rs. 5,000 and SI is Rs. 1,000 for 2 years.
Statement IITime is 2 years.
ExplanationStatement I alone gives R = 10%. -
DS2 Easy
What is the rate?
Statement IPrincipal is Rs. 8,000.
Statement IISI is Rs. 960 for 3 years.
ExplanationNeed P, SI and T together. R = 4%.
-
DS3 Medium
What is the rate?
Statement ISI is Rs. 1,500.
Statement IIPrincipal is Rs. 10,000 and time is 3 years.
ExplanationTogether: R = 5%. -
DS4 Medium
Is the rate greater than 8%?
Statement IP = Rs. 12,000, SI = Rs. 3,600, T = 3 years.
Statement IITime is 3 years.
ExplanationStatement I: R = 10%, which is greater than 8%.