What is 6.92 with an exponent of 0?

Need this asap if anyone can i would be very grateful. if you could show workings that would really

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

What percent of 18 is 24? and plz explain thx.