Simple Interest/Compound Interest Questions IBPSÂ PO, SBI PO, NIACL, NICL, LIC, Dena Bank PO PGDBF, BOI, Bank of Baroda and other competitive exams

- If the C.I on certain sum at 20% rate of interest in 2yrs is 13200. Then find the simple interest on same sum at same rate of interest when time is 3yrs.

A) Rs18,000

B) Rs12,000

C) Rs15,000

D) Rs20,000

E) Rs25,000

View Answer

**Option A**

** Solution:**

C.I for 2yrs = 20% = 1/5

. Â Â 5 ……………….6

. Â Â 5 ……………….6

. Â 25 ………………36

11/25 * 100 = 44%

44% = 13200

We need S.I = 20*3 = 60%

1% = 300

60% = 18,000

- A sum of money becomes 6000 after 2yrs and 9000 after 4yrs. Find the sum?

A) 3000

B) 4000

C) 4500

D) 5000

E) 3500

View Answer

**Option B**

** Solution:**

A : B : C

Note : when time is same then ratio uses to solve question. See below

A : B = B : C

X : 6000 = 6000 : 9000

X = 4000

- If a sum of Rs216 becomes 343 in 3yrs. Then find C.I on Rs43,200 in 3yrs at the same rate of interest?

A) 20,000

B) 25,000

C) 24,400

D) 25,400

E) 26,000

View Answer

**Option D**

** Solution:**

first we will find rate of interest

Note : – root varies according to time, here Time is 3 yrs so

(216)^{1/3} : (343)^{1/3}

6 : 7 â€“ difference is 1. Now 1/6*100 = 16(2/3)%

Now according to question C.I for 3 yrs

16(2/3)% = 1/6 . Â Â Â Â 6 …………7

. Â Â Â Â Â Â Â Â Â Â Â Â . Â Â Â Â 6 …………7

. Â Â Â Â Â Â Â Â Â Â Â Â . Â Â Â Â 6 …………7

216 âˆ’ 343 = 127

216 =43,200

1 = 200

127 = 25,400 Â

- A sum of money invested at C.I double itself in 6yrs. At the same rate of interest it will amount to eight times of itself in how many years?

A) 15yrs

B) 12yrs

C) 18yrs

D) 10yrs

E) 22yrs

View Answer

**Option C**

** Solution:**

NOTE :- sum increase in C.I in a manner â€“ 1 â€¦2â€¦4â€¦8â€¦16

6 Â Â Â 6 Â Â Â 6 = 18 yrs Â

- A sum of money invested at S.I triple itself in 6yrs. At the same rate of interest it will amount to 9 times of itself in how many years?

A) 24yrs

B) 22yrs

C) 18yrs

D) 16yrs

E) 25yrs

View Answer

**Option A**

** Solution:**

In Simple interest P become 3P, it means 2P Is interest.

2P = 6

P = 3

To make 9P, 8P will be interest = 24yrs Â

- At a sum of Rs24000 a man charge C.I at 16(2/3)% rate of interest in 1st year and 14(2/7)% in 2nd year and 12.5% in 3rd year. Find the C.I?

A) 15000

B) 12000

C) 18000

D) 10000

E) 22000

View Answer

**Option B**
** Solution:**
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- A sum becomes 24200 in two years and 26620 in 3years. Find the sum?

A) 20000

B) 18000

C) 16000

D) 21000

E) 23000

View Answer

**Option A**

** Solution:**

to find rate = 26620 â€“ 24200/24200 * 100 = 10%

24200 is an amount after 2yr.

. Â 10…………….. 11

. Â 10…………….. 11

. Â 100……………..121 = 24200

. Â Â So 100 = 20000

- Find the C.I on Rs12000, if the rate of interest is 20% and time is 2yrs and it is compounded half yearly?

A) 5560

B) 5558

C) 5558.2

D) 5569.2

E) 5467.2

View Answer

** Option D**

** Solution:**

note â€“ in half yearly time – double, R.O.I – half

R=10%, T = 4yrs

12000

1200 …1200 ….1200 ….1200

. Â Â Â Â Â …120 Â Â ….120 Â ….120

. Â Â Â Â Â Â Â Â Â Â Â ….120 Â ….120

. Â Â Â Â Â Â Â Â Â Â Â ….12 Â Â ….120

. Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ….12

. Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ….12

. Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ….12

. Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ….1.2

. Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 5569.2

- If the difference between C.I and S.I is Rs12400 with 10% rate of interest in 3yrs. Then find the sum?

A) 300000

B) 500000

C) 400000

D) 600000

E) 200000

View Answer

**Option C**

** Solution:**

S.I in 3yrs = 10*3 =30%…C.I in 3yrs

. Â Â 10 ………..11

. Â Â 10 ………..11

. Â Â 10 ………..11

. Â Â 1000 â€“ 1331 = 33.1%

Difference = 33.1 % âˆ’ 30% = 3.1%

3.1= 12400

100 = 400000

- S.I on certain sum for 3years at any rate of interest is Rs225 while C.I on the same sum at the same rate for 2yrs is 153. Find the rate%?

A) 5%

B) 6%

C) 4%

D) 7%

E) 8%

View Answer

**Option C**

** Solution:**

S.I for 1yr = 225/3 =75

S.I for 2nd yr= 150

S.I Â Â Â Â 75 Â Â Â Â 75

C.I Â Â Â Â Â Â Â Â Â Â 3(153-150=3)

3/75 * 100 = 4%

ty))

mam i think in que no 2 as there nothing mentioned abt the type of interest v hav to adopt si as interst and in that case sum =3000 but soln ci is adopted…..:))