A box has 100 blue balls, 50 red balls, 50 black balls. 25% of blue balls and 50% of red balls are taken away. Percentage of black balls at present is

A box has 100 blue balls, 50 red balls, 50 black balls. 25% of blue ba

1.	A box has 100 blue balls, 50 red balls, 50 black balls. 25% of blue balls and 50% of red balls are taken away. Percentage of black balls at present is
A.	50%
B.	25%
C.	<table><tr><td rowspan="2">33 </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2">%</td></tr><tr><td align="center">3</td></tr></table>
D.	40%
Answer» D. 40%

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A box has 100 blue balls, 50 red balls, 50 black balls. 25% of blue balls and 50% of red balls are taken away. Percentage of black balls at present is

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