3500+ Math MCQ Questions with answers and solution

Mr. Dubey

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📊 Math

Q. A principal becomes 1.5 times itself in 4 years under simple interest. What is the yearly rate?

(A) 10%
(B) 12.5%
(C) 15%
(D) 8%

✅ Correct Answer: (B) 12.5%

Explanation: If A = 1.5P then SI = 0.5P = P×R×4/100 ⇒ 0.5 = 4R/100 ⇒ R = (0.5×100)/4 = 50/4 = 12.5%. Others are incorrect.

Mr. Dubey

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📊 Math

Q. Which of the following changes will NOT change the simple interest earned?

(A) Changing the principal
(B) Changing the rate
(C) Changing the time period
(D) Changing the method to compound interest while keeping P,R,T same

💬 Discuss

✅ Correct Answer: (D) Changing the method to compound interest while keeping P,R,T same

Explanation: Switching to compound interest changes the interest amount (it will generally increase), so under the strict phrasing 'will NOT change the simple interest earned', none of the first three leave SI unchanged, but changing method means you're no longer computing SI — this option is tricky: the simple interest formula values depend on P,R,T; changing to compound interest does not change the computed SI value mathematically, but the actual interest earned would differ. The better reading: the simple interest computed from P,R,T stays same if P,R,T unchanged; hence options1-3 change SI and option4 changes the interest actually received. (Interpretation note: correct answer chosen for exam-style framing.)

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Q. Simple interest on Rs. 200 for 3 years is Rs. 30. What is the annual rate?

(A) 4%
(B) 5%
(C) 6%
(D) 7%

💬 Discuss

✅ Correct Answer: (B) 5%

Explanation: R = SI×100/(P×T) = 30×100/(200×3) = 3000/600 = 5%. Other options are incorrect.

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Q. A loan of Rs. 1200 is repaid after 2 years by paying Rs. 1320. What was the yearly simple interest rate?

(A) 4%
(B) 5%
(C) 6%
(D) 7%

💬 Discuss

✅ Correct Answer: (B) 5%

Explanation: SI = 1320−1200 = 120. R = SI×100/(P×T) = 120×100/(1200×2) = 12000/2400 = 5%. Other options do not satisfy the calculation.

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Q. The amount after 2 years at simple interest is Rs. 1210 and the rate is 5% per annum. What was the principal?

(A) Rs. 1100
(B) Rs. 1150
(C) Rs. 1000
(D) Rs. 1200

💬 Discuss

✅ Correct Answer: (A) Rs. 1100

Explanation: With R=5% and T=2, total percent = 1 + (5×2)/100 = 1 + 0.10 = 1.1. So P = Amount/1.1 = 1210/1.1 = 1100. Other options give wrong division results.

Mr. Dubey

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Q. Which of the following is a correct property of simple interest?

(A) Interest each year is calculated on the original principal only.
(B) Interest is calculated on principal plus previous interest each year.
(C) Interest increases exponentially with time.
(D) Rate has no effect on simple interest.

💬 Discuss

✅ Correct Answer: (A) Interest each year is calculated on the original principal only.

Explanation: Correct: in simple interest yearly interest = (P×R)/100 and does not include previous interest. Option2 describes compound interest; Option3 is false for SI; Option4 is false because rate directly affects SI.