RRB RPF RPSF SI and CONS Model Papers 7 with solutions

Question : 62 of 120

Marks: +1, -0

At a certain rate of simple interest, a certain sum of money becomes double of itself in 10 years. It will become treble of itself in

Solution:

(3) If principal = Rs. x and rate = r% p.a. then
Rate

= { {SI} × 100}/{ { \Principal } × { \Time }}

= {x × 100}/{x ×10}=10 \%

Case II
∴ Time

= { {\SI} × 100}/{ { \Principal } ×{ \Rate }}

= {2 x × 100}/{x × 10}

=20

years

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