Question of the day 4th February 2016

In New York Water purifying system has 3 levels of filtering. 30% of the impurity is filtered out in the first level itself and the rest passes on to the second level. At the second level, 50% of incident impurities get obstructed while the third level blocks out 85% of the impurities reaching this level. Approximately, what percentages of the Water’s impurities remain in New York City’s water?

a.2.9%

b. 3.5%

c. 5.25%

d.7.25%

e. 12.75%