Can someone help me figure out how to calculate the percentages

What problem would a person have if the nucleic acid in one of his or her cells were damaged?

Which of the following true? a_volcanoes and earthquakes often near the plate boundaries. b_volcanoes occur whereve there are tall mountains. c_earthquakes cause volcanoes in the same location to erupt violently d_volcanoes and earthquakes occur only where plates are colliding with each other

Can someone me with questions 12 and 13 plz.