1) Genius is one percent inspiration, ninety-nine percent perspiration. 

2) Life is ten percent what you make it and ninety percent how you take it. 

3) I am 100 percent in agreement.

4) Sales were five percent lower than predicted.

5) Ninety percent of the people surveyed were in favour.

6) Proper preparation solves 80 percent of life's problems.

7) He lent me the money at 5 percent interest.

8) I agree with you a hundred percent.

9) You got 20 percent of the answers right - that means one in every five.

10) Machines are delivering up to only 25 percent of the fuel they combust.

11) Recent opinion polls show that 60 percent favor abortion under certain circumstances.

12) Something like sixty percent of all married men will have an affair at some point in their marriage.

13) Preliminary results show the Republican party with 11 percent of the vote.

14) Almost 80 percent of the state's residents were born elsewhere.

15) The dollar fell by 24 percent against the yen between 1970 and 1973.

16) The price was reduced by 10 percent.

17) Crime has gone down 70 percent.

18) One fifth is the same as 20 percent.

19) The country devalued its currency by 5 percent.

20) Only 62 percent of respondents said they were satisfied.

21) Sixty percent of people voted no.

22) I'm not a hundred percent sure where she lives.

23) Inflation will be down to three percent.

24) 60 percent of the population is non-white.

25) The occupancy rate of beds has been averaging out about 80 percent.

26) The French government has devalued the franc by 20 percent.

27) The drug increases the number of red cells in the blood,[http://sentencedict.com/percent.html] enhancing oxygen uptake by 10 percent.

28) Our high living standards cause our present population to consume 25 percent of the world's oil.

29) By the end of the year the Prime Minister's approval rating had fallen as low as 12 percent.

30) Confidence doesn't need any specific reason. If you're alive , you should feel 100 percent confident.