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Q:

What is the compound interest earned at the end of 3 years?

I. Simple interest earned on that amount at the same rate and for the same period is Rs. 4500.

II.The rate of interest is 10 p.c.p.a.

III.Compound interest for 3 years is more than the simple interest for that period by Rs.465.

A) I and II only B) II and III only
C) I and III only D) Either II or III only

Answer:   D) Either II or III only



Explanation:

 

 

 

 

 

 

I. gives, S.I for 3 years = Rs. 4500.

 

 

 

II. gives, Rate = 10% p.a.

 

 

 

III. gives, (C.I.) - (S.I.) = Rs. 465.

 

 

 

Clearly, using I and III we get C.I. = Rs. (465 + 4500).

 

 

 

Thus, II is redundant.

 

 

 

Also, from I and II, we get sum =

 

 

 

100 x 4500

 

 

 

= 15000.

 

 

 

10 x 3

 

 

 

Now C.I. on Rs. 15000 at 10% p.a. for 3 years may be obtained.

 

 

 

Thus, III is redundant.

 

 

 

Either II or III is redundant.

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A man has some hens and some cows. If the total number of heads of hens and cows together is 50 and the nunber of feet of hens and cows together is 142, then the number of cows is

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C) 27 D) 29
 
Answer & Explanation Answer: A) 21

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If sinθ+ cosecθ=2, then the value of sin-7+cosec7 is

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Length of three line segments isgiven. Is construction of a triangle possible with the segments in the given cases?

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Answer & Explanation Answer: B) 8 cm, 15 cm, 17 cm

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From an external point two tangents to a circle are drawn. The chord passing through the points of contact subtends an angle72° at the centre. The angle between the tangents is?

A) 36° B) 72°
C) 108° D) 144°
 
Answer & Explanation Answer: C) 108°

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If x+3y=-3x+y, then x22y2 is equal to

A) 1/8 B) 1/2
C) 1/4 D) 4
 
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If a2+1=a, then the value of a3 is

A) 0 B) 1
C) -1 D) 2
 
Answer & Explanation Answer: C) -1

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A train 240 meters in length crosses a telegraph post in 16 seconds. The speed of the train is?

A) 50 Km/hr B) 52 Km/hr
C) 54 Km/hr D) 56 Km/hr
 
Answer & Explanation Answer: C) 54 Km/hr

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In a Village panchayat society 574 names are enlisted as 'below poverty level'. If 14% of the villagers are below poverty level, the total number of villagers is?

A) 4100 B) 4200
C) 4000 D) 3800
 
Answer & Explanation Answer: A) 4100

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