Pine

How much of a mixed forest rangers want to cut down, if their head said:

"We only cut down pine trees, which in our mixed forest 98%. After cut pine trees constitute 94% of all trees left."

Correct result:

p =  66.67 %

Solution:

$p = 100\cdot (1-\dfrac{ 100-98}{100-94}) = 66.67 \%$

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