Aptitude - Compound Interest - Discussion
Discussion Forum : Compound Interest - General Questions (Q.No. 7)
7.
At what rate of compound interest per annum will a sum of Rs. 1200 become Rs. 1348.32 in 2 years?
Answer: Option
Explanation:
Let the rate be R% p.a.
| Then, 1200 x |  |
1 + | R |  |
2 | = 1348.32 |
| 100 |
 |
|
1 + | R | |
2 | = | 134832 | = | 11236 |
| 100 | 120000 | 10000 |
 |
|
1 + | R | |
2 | = | |
106 | |
2 |
| 100 | 100 |
| 1 + |
R | = | 106 |
| 100 | 100 |
R = 6%
Discussion:
40 comments Page 1 of 4.
Daba said:
2 years ago
Very good, Thanks all for explaining.
(1)
Etsub said:
2 years ago
I can't understand it. Please explain me to get it.
Chimi said:
4 years ago
When 134832/12 = 11236.
120000/12 = 10000.
120000/12 = 10000.
(5)
Kaushal said:
5 years ago
How to do this problem without applying formula?
(2)
Sanjeev said:
5 years ago
@Praveen.
It's logically.
It's logically.
Vaibhav said:
6 years ago
How come 11236?
Saikat Ghosh said:
6 years ago
@Linka.
The shortcut method to find the Square root of 11236 is:
1*1=1,
2*2=4,
3*3=9,
4*4=16,
5*5=25, 6*6=36, 7*7=49, 8*8=64, 9*9=64, 10*10=100, 11*11=121, 12*12=144..
At first, see the last no i.e 6.
So 6 can be found either in 4 square or in 6 square.
Now, look at the first three numbers i.e. 112 which is near to square 10 as the square root of 11 will be more.
So 10*(10+1)=110.
Now see that 112<110.
So 6 square will be taken. Therefore square root of 11236 is 106.
The shortcut method to find the Square root of 11236 is:
1*1=1,
2*2=4,
3*3=9,
4*4=16,
5*5=25, 6*6=36, 7*7=49, 8*8=64, 9*9=64, 10*10=100, 11*11=121, 12*12=144..
At first, see the last no i.e 6.
So 6 can be found either in 4 square or in 6 square.
Now, look at the first three numbers i.e. 112 which is near to square 10 as the square root of 11 will be more.
So 10*(10+1)=110.
Now see that 112<110.
So 6 square will be taken. Therefore square root of 11236 is 106.
(2)
Suraj said:
6 years ago
What is the answer, if 9 months is given here instead of 2 years?
Aarav said:
6 years ago
Give shortcut to get the answer clearly.
(1)
Praveena said:
6 years ago
1+R/100=106/100.
R/100=106/100-1,
R/100=106-100/100,
R/100=6/100,
100R=600,
R=6.
R/100=106/100-1,
R/100=106-100/100,
R/100=6/100,
100R=600,
R=6.
(8)
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