I need help on solving the % difference for the steel sphere and acrylic sphere and answering the question below. I have collected the data and now need to solve step E and answer the question below. Thank you!

		Steel Sphere	Acrylic Sphere
A	Length of Track (cm) (s) (Step 1, use 80 cm)	80 cm	80 cm
B	Angle of Elevation (q) in Degrees? (Step 1)

\ffirst value - second value percent difference = first value + second value x 100% 2