I need to do 13-24 on this and don't understand at all. can someone do a few different problems and put the work down? and if possible what buttons I'm supposed to be using for the graphing calculator?

12.) a

reason: 70% of 20 is 14

13.) c

reason: 80% of 10 is 8 and that’s more than 6 so it’s at least 6

21.) about 27.77% people have their pets bathed professionally

reason: 27.77% of 18 is 4.9986 which is really close to 5

22.) about 64.28% people own an answering machine

reason: 64.28% of 14 is 8.9992 which is almost exactly 9

23.) 30% people believe

reason: 30% of 10 is 3 which is exactly 3 people

24.) 60% people have never heard of the internet

reason: 60% of 20 is 12 which is exactly 12 people

I need to do 13-24 on this and don't understand at all. can someone do a few different problems and put the work down? and if possible what buttons I'm supposed to be using for the graphing calculator? ​

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I need to do 13-24 on this and don't understand at all. can someone do a few different problems and put the work down? and if possible what buttons I'm supposed to be using for the graphing calculator?