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  1. A number is decreased by 10% and the resulting number is again decreased by 20%. What is the final percentage of decrease?
    1. 25%
    2. 26%
    3. 27%
    4. 28%
Correct Option: D

Effective percentage decrease

=x + y +
xy
%
100

=- 10 - 20 +
(- 10) × (- 20)
%
100

= (– 30 + 2)% = –28%


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