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- Question
- The height of a tree increases every year 1/8 times. If the present height of the tree is 64 cm, then what will be its height after 2 yr?
Options- A. 76 cm
- B. 80 cm
- C. 81 cm
- D. 84 cm
- Correct Answer
- 81 cm
ExplanationPercentage growth = (1/8) x 100 % = 12.5%
Height after 2 yr = 64 x (1+ 12.5/100)2
= 64 x (9/8) x (9/8) = 81 cm - 1. The simple interest on a certain sum for 2 yr is ? 120 and compound interest is ? 129. Find the rate of interest.
Options- A. 14%
- B. 15%
- C. 12%
- D. none of the above Discuss
- 2. A certain sum at compound interest amounts to ? 12960 in 2 yr and ? 13176 in 3 yr. Find the rate per cent per annum.
Options- A. 11/3%
- B. 21/3%
- C. 12/3%
- D. 22/3% Discuss
- 3. The compound interest is ? 6.40 more than the simple interest, if a sum is lent for 2 yr at 8% compound interest. Find the sum.
Options- A. ? 1800
- B. ? 10000
- C. ? 800
- D. ? 1000 Discuss
- 4. If the difference between the compound interest and simple interest on a sum of money at 5% pa for 2 yr is ? 16, then find the simple interest?
Options- A. ? 840
- B. ? 932
- C. ? 520
- D. ? 640 Discuss
- 5. A sum, at the compound rate of interest, becomes 2 1/ 2 times in 6 yr. The same sum becomes what times in 18 yr?
Options- A. 5/2
- B. 25/4
- C. 125/8
- D. 625/16 Discuss
- 6. An amount at the rate of 5% pa becomes ? 10 more at compound interest than that of simple interest after 2 yr. Calculate the principal.
Options- A. ? 4000
- B. ? 4050
- C. ? 5000
- D. ? 5500 Discuss
- 7. The principal amount which yields a compound interest of ? 208 in the second year at 4% is
Options- A. ? 5000
- B. ? 10000
- C. ? 130000
- D. ? 6500 Discuss
- 8. Find the compound interest for a sum of ? 9375 in 2 yr, if the rate of interest for the first year is 2% and for the second year is 4%.
Options- A. ? 570
- B. ? 670
- C. ? 770
- D. ? 760 Discuss
- 9. The population of a country is 100 crore and it is the possibility that the population will become 13.31 crore in 3 yr. What will be the annual rate percent on this growth?
Options- A. 8%
- B. 12.7%
- C. 10%
- D. 15% Discuss
- 10. If the different between the compound interest and the simple interest on a certain sum for 2 yr at 8% per annum is ? 32, then the sum is
Options- A. ? 5000
- B. ? 5550
- C. ? 6000
- D. ? 5250 Discuss
Compound Interest problems
Search Results
Correct Answer: 15%
Explanation:
Here, n = 2 yr, SI = ? 120 and CI = ? 129
CI = SI (1+ R/200)
? 129 = 120(1 + R/200)
? 129/120 = 1 + R/200
? (129/120) - 1 = R / 200
? 9/120 = R/200
? R = (9 x 200)/120 = 15%
Correct Answer: 12/3%
Explanation:
SI for on ? 12960 for 1 yr
= 13176 - 12960 = ? 216
By formula, SI = (P x R x T)/ 100
? 216 = (12960 x R x 1)/100
? R = 5/3 = 12/3
Correct Answer: ? 1000
Explanation:
Here, D = ?6.40, R = 8% and n = 2 yr
Then, according to the formula,
Difference between compound interest and simple interest
D = PR2 / 1002
? 6.40 = P x 64/10000
? P = ? 1000
Correct Answer: ? 640
Explanation:
Given, CI - SI = 16, R = 5%, n = 2 yr and SI = ?
According to the formula,
CI - SI = (SI x R)/200
? 16 = (SI x 5)/200
? 16 = SI/40
? SI = ? 640
Correct Answer: 125/8
Explanation:
If sum is P, then P becomes 5P/2 in 6 yr.
5P/2 becomes 25P/4 in 12 yr.
25P/4 becomes 125P/8 in 18 yr.
The sum becomes 125/8 times in 18 yr.
Correct Answer: ? 4000
Explanation:
Here, CI - SI = 10, R = 5%, n = 2 yr and P = ?
According to the formula,
CI - SI = PR2/1002
? 10 = (P x 25)/10000
? P = (400 x 10) = ? 4000
Correct Answer: ? 5000
Explanation:
Let the principal be ? P.
Amount after first year = (P x 104)/100 and
amount after second year P x (104/100) x (4/100)
According to the question.
(P x 104 x 4)/(100 x 100) = 208
? P = ? 5000
Correct Answer: ? 570
Explanation:
Given, P = ? 9375, R1 = 2% and R2 = 4%
According to the formula,
A = P (1 + R1/100) (1 + R2/100)
= 9375 (1 + 2/100) (1 + 4/100)
= 9375 x (51/50) x (26/25)
= 7.5 x 51 x 26
= ? 9945
Now CI = A - P = 9945 - 9375 = ? 570
Correct Answer: 10%
Explanation:
Given, P = 10 crore
and population after 3 yr = 13.31 crore
According to the formula,
Population after n yr = P (1 + R/100 )n
? 13.31 = 10 (1 + R/100 )3
? 1331/1000 = (1 + R/100 )3
? (11/10)3 = (1 + R/100 )3
? 1 + R/100 = 11/10
? R/100 = 11/10 - 1 = 1/10
? R = 10%
Correct Answer: ? 5000
Explanation:
Given, R = 8%, D = ? 32 and P = ?
By formula, D = P(R/100)2
? 32 = P(8/100)2
? P = 32 x [(100 x 100)/(8 x 8)]
= ? 5000
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