Find the percentage of increase in marks in a test increased from 20 to 30

With number 11 ( show how you got the answer)

In the diagram, be and ad pass throughthe center of circle o, and the area ofsector aoc is 47.45 square units. what isthe area of sector boc? use the value =3.14, and round your answer to two decimalplaces.22.33 square units25.12 square units

Fiona has to plot a histogram of the given data