mr roopchand finds that an increase in the rate of interest from..., Simple Interest, General Mathematics

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Question:Mr.Roopchand finds that an increase in the rate of interest from  $4 7/8%$  to  $5 1/8%$  per annum increases his yearly income by Rs. $25$ .His investment is :

A  $Rs. 10,000$  
B  $Rs. 12,000$  
C  $Rs,15,000$  
D  $Rs. 20,000$

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+ AnswerA

+ ExplanationLet the investment be Rs.x.Then,

 $x + 41/8 xx 1/100 - x xx 39/8 xx 1/100$ 

 $= 25 ⇔ 2x$ 

 $=20000 ⇔ x$ 

 $= 10000$

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Question:Mr.Roopchand finds that an increase in the rate of interest from 478%4 7/8% to 518%5 1/8% per annum increases his yearly income by Rs.2525.His investment is :

A Rs.10,000Rs. 10,000

B Rs.12,000Rs. 12,000

C Rs,15,000Rs,15,000

D Rs.20,000Rs. 20,000

A

Question:Mr.Roopchand finds that an increase in the rate of interest from $4 7/8%$ to $5 1/8%$ per annum increases his yearly income by Rs. $25$ .His investment is :

A $Rs. 10,000$

B $Rs. 12,000$

C $Rs,15,000$

D $Rs. 20,000$