Postal or Sorting Assistants Model Paper 9 With Solutions

Question : 4 of 100

Marks: +1, -0

A certain sum of money becomes three times of itself in 20 years at simple interest. In how many years will the initial sum become double at the same rate of simple interest?

Validate

Solution:

(b) Let Principal = x
Amount =3x
Simple interest = 2x
Rate

={2x×l00}/{x×20}=10%

Now, required time

= {x × 100}/{x × 10}=10

years

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