Maths / Comparing Quantities / Simple Interest

QUESTION
 

If a sum doubles in four years at the rate of R% per annum simple interest, then 3R= _________ .

OPTIONS
A. 

30

B. 

45

C. 

75

D. 

90

Right Option : C

EXPLANATION
Explain TypeExplanation Content
Text

Let the sum be P = Rs. 100.

As given,, P = Rs. 100, A = Rs. 200, T = 4 years.

Then, SI = A = Rs. 200 - Rs. 100 = Rs. 100

We have SI =frac{PTR}{100}

Rightarrow 100=frac{100times 4 times R}{100}Rightarrow R=frac{100}{4}=25Rightarrow 3R=75

Hence, the correct option is (c).

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