In a survey of 320 employees, 35 percent said that they take tea, and 45 percent said that they take coffee. What percent of those surveyed said that they take neither tea nor coffee?

(1) 25 percent of the employees said that they take coffee but not tea.
(2) 400/7 percent of the employees who said that they take tea also said that they also take coffee.
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I dont know if this is right but

Q: asks for people who neither drink coffee nor tea. Total = 100 ; T=35 ; C=45 . I guess we do not need to consider the 320 people because question is about percentage and Coffee and Tea drinker are given in percentage.

Formula: Total=T+C - BOTH + NEITHER --> 100=35+45 -Both + Neither
Q asks for Neither so any statement that can give us -Both would be sufficient.

S1: 25% said Coffee yes, tea no --> so only coffee = 45-25= 20% only drink coffee; 20 is the both value ; Neither= 100-35-45+20 = 40
S2: 400/7 percent of tea drinker also drink coffee. --> 400/7 percent = 400/7*100 (bc. of percent) = 4/7 so Both value= 4/7*35= 20 ; again Neither=100-35-45+20=40

Both statements are alone sufficient, Hence D.

Since both answers yield me the same result Both=20 ; Neither=40 I hope it is right.