Compound Interest Practice Test Set 3

Step 1: Identify what the question asks and note the relevant values from the question.
Step 2: Apply the appropriate compound-interest or simple-interest relationship.
Interest earned in the 3rd year = 15,972 - 14,520 = Rs 1,452. Rate R = (1,452 / 14,520) * 100% = 10%.

Step 3: Match the calculated result with the options.
The matching value is the correct answer.

Correct Answer: Option A.

Step 1: Identify what the question asks and note the relevant values from the question.
Step 2: Apply the appropriate compound-interest or simple-interest relationship.
Rate = 12.5% = 1/8. Let Principal P = 8^2 = 64 units. CI for 2 years = 2(8) + 1 = 17 units = Rs 510 => 1 unit = Rs 30. SI for 2 years = 2 * 8 = 16 units = 16 * 30 = Rs 480.

Step 3: Match the calculated result with the options.
The matching value is the correct answer.

Correct Answer: Option B.

Step 1: Identify what the question asks and note the relevant values from the question.
Step 2: Apply the appropriate compound-interest or simple-interest relationship.
Amount A = P * (1 + 10/100)^3 => 13,310 = P * (1.$1)^3$ = 1.331 P => P = 13,310 / 1.331 = Rs 10,000.

Step 3: Match the calculated result with the options.
The matching value is the correct answer.

Correct Answer: Option C.

Step 1: Identify what the question asks and note the relevant values from the question.
Step 2: Apply the appropriate compound-interest or simple-interest relationship.
Half-yearly rate = 5%. Time = 3 half-years. Effective CI = 15.7625%. Compound interest = 20,000 * 15.7625% = Rs 3,152.50.

Step 3: Match the calculated result with the options.
The matching value is the correct answer.

Correct Answer: Option D.

Step 1: Identify what the question asks and note the relevant values from the question.
Step 2: Apply the appropriate compound-interest or simple-interest relationship.
Difference between CI and SI for 2 years = P * (R/100)^2 = 12,500 * (8/100)^2 = 12,500 * 0.0064 = Rs 80.

Step 3: Match the calculated result with the options.
The matching value is the correct answer.

Correct Answer: Option A.