In how many years will a sum of money become three times itself at 12.5% per annum simple interest?
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Correct answer: (D) 16 years
DSSSB TGT / PGT · Mathematics
Simple & Compound Interest Previous Year Questions
11 Simple & Compound Interest (Mathematics) questions asked in DSSSB TGT / PGT previous year papers, each with the correct answer and explanation. Read them free on UTpaper, or attempt the full papers as timed online tests.
- 11 questions
- Official answer key
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Other Mathematics topics
What is the compound interest on ₹ 10,000 for 1 year at 20% per annum, compounded half-yearly?
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Correct answer: (B) ₹ 2,100
A sum of money doubles itself in 5 years at compound interest. In how many years will it become 8 times?
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Correct answer: (D) 15 years
A sum of money at simple interest amounts to ₹ 9800 in 5 years and ₹ 12005 in 8 years.
The rate of interest per annum is:
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Correct answer: (D) 12%
What is the compound interest on ₹ 12,000 at 10% per annum for 3 years, compounded annually?
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Correct answer: (C) ₹ 3,972
At what rate percent per annum will ₹ 2500 amount to ₹ 3400 in 4 years at simple interest?
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Correct answer: (B) 9%
A sum of money becomes 7/4 of itself in 6 years at simple interest. The rate of interest per annum is:
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Correct answer: (B) 12.5%
The difference between compound interest and simple interest on ₹ 8000 for 2 years at 5% per annum is:
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Correct answer: (D) ₹ 20
What is the compound interest on (compounding annually) Rs. 14400 at the rate of 10
percent for 3 years?
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Correct answer: (D) Rs. 4766.4
Explanation
Amount = 14400 × 1.1³ = 14400 × 1.331 = 19166.4. CI = 19166.4 − 14400 = Rs. 4766.4.
Simple interest and compound interest (compounding annually) on a principal at a
certain rate of interest for 2 years is Rs. 28800 and Rs. 36000 respectively. What is the
principal?
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Correct answer: (B) Rs. 28800
Explanation
SI per year = 28800/2 = 14400. CI − SI = 7200 is interest on the first year's interest, so rate = 7200/14400 = 50 percent. Principal = 14400 / 0.5 = Rs. 28800.
The simple interest on a sum for 11 years is Rs. 42000. The rate of interest for the
first 4 years is 3 percent per annum and for the next 7 years is 9 percent per annum.
What is the sum?
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Correct answer: (B) Rs. 56000
Explanation
Total rate over the period = 4 × 3 + 7 × 9 = 75 percent of the sum. So sum = 42000 / 0.75 = Rs. 56000.
How to use these DSSSB TGT / PGT Mathematics questions
Every question here was asked in a real DSSSB TGT / PGT paper; the paper and shift are shown on the card, and the number opens the question on its own page. Try each one before tapping Show answer, then attempt the full DSSSB TGT / PGT papers as timed tests to check your speed under exam conditions.