Bunuel wrote:

Official Solution:

If 25% of the company's employees contribute at least 4% of their salary to the Charity Fund, what percent of the company's employees contribute at least 5% of their salary to the Charity Fund?

Say:

X% contribute less than 4%;

Y% contribute at least 4% but less than 5%;

Z% contribute at least 5%.

Note that these groups don't have intersections and \(X+Y+Z=100\).

Given: \(Y+Z=25\%\). Question: \(Z=\)?

(1) 20% of the company's employees contribute at least 4% but less than 5% of their salary to the Charity Fund. Given: \(Y=20\%\). Hence, \(Y+Z=20+Z=25\%\), which gives \(Z=5\%\). Sufficient.

(2) 95% of the company's employees contribute less than 5% of their salary to the Charity Fund. Given: \(X+Y=95\%\). Hence, \(X+Y+Z=95+Z=100\%\), which gives \(Z=5\%\). Sufficient.

Answer: D

Please help me understand if I am going wrong.

so lets say we have at least 4% : so lets call it X

now we have at least four but less than 5% : so this is essentially from 4% to something less than 5%

now at least 5% is 5 and above. So let me try and draw a line

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