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  1. At what rate per cent per annum will the simple interest on a sum of money be 2/5 of the amount in 10 years ?
    1. 4%
    2. 6%
    3. 5
      2
      %
      3
    4. 6
      2
      %
      3
Correct Option: D

Here , T = 10 years
According to question ,
Let P be the principal and R% rate of interest.

∴ SI =
PR × 10
=
PR
10010

According to the question,
PR
= P +
PR
×
2
10105

R
= 1 +
R
×
2
10105

R
=
2
+
R
10525

R
-
R
=
2
10255

5R - 2R
=
2
5025

3R
=
2
505

⇒ R =
50 × 2
=
20
= 6
2
%
3 × 533



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