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  1. If the discount of 10% is given on the marked price of a radio, the gain is 20%. If the discount is increased to 20%, the gain percent is :
    1. 5%
    2. 6
      1
      %
      4
    3. 6
      2
      %
      3
    4. 7
      5
      %
      8
Correct Option: C

Let the C.P. of article be Rs. 100 and the marked price be Rs. q.
Case I

=
q × 90
= 120
100

⇒  q =
120 × 100
90

Marked price q = Rs.
400
3

Case II
S.P. =
q × 80
= Rs.
4q
1005

= Rs.
4
×
400
= Rs.
320
533

∴  Profit = Rs.
320
− 100
3

Profit = Rs.
320 − 300
3

Profit = Rs.
20
3

∴  Profit percent =
20
%
3

Profit percent = 6
2
%
3


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