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C :)

First day $100, Second day -10% = $90, thirdly day -10% of second day = $90x 9/10= $81

$81/100=81%
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consider price of the all items as $100
after a initial reduction of 10% price becomes = 0.9 *100 = $ 90
after the final reduction of 10% price becomes = 0.9* 90 = $ 81
price of all items on second day is 81% of price on first day
correct answer option C
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Let the price before any reduction be 100( As this is a percentage question)

After first reduction, the price reduced to 100*(90/100)
= 90
After second reduction, the price reduced to 90*(90/100)
= 81(C)

Required percentage = 81/100*(100)
= 81%
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