the difference between the compound interest and simple earned at end of..., Compound Interest, General Mathematics

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Question:The difference between the compound interest and simple interest earned at the end of second year on a sum of money at  $10%$ per annum is Rs.  $20$ .The sum is :

A  $Rs.4000$  
B  $Rs. 2000$  
C  $Rs. 1500$  
D Date inadequate

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+ AnswerB

+ ExplanationLet the principal be Rs. x. Then,

C.I $= [ x (1 + 10/100)^2$ 

S.I. $= ((x xx 10 xx 2)/100)$ 

 $= x/5$ 

:. (C.I) - (S.I)

 $= ((21x)/100 - x/5)$ 

 $= x/100$ 

 $:. x/100 = 20$ 

 $or x = 2000$

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Question:The difference between the compound interest and simple interest earned at the end of second year on a sum of money at 10%10%per annum is Rs. 2020.The sum is :

A Rs.4000Rs.4000

B Rs.2000Rs. 2000

C Rs.1500Rs. 1500

D Date inadequate

B

Question:The difference between the compound interest and simple interest earned at the end of second year on a sum of money at $10%$ per annum is Rs. $20$ .The sum is :

A $Rs.4000$

B $Rs. 2000$

C $Rs. 1500$