clc
//Initialization of variables
x1=9
x2=1.2
x3=1.5
x4=88.3
//calculations
a=x1+x2
b=2*a
xO=(2*x1 + x2+ 2*x3 + b)/2
xN=x4/3.76
ratio=xO/a
percent=ratio/2 *100
//results
printf("Percent theoretical air = %.1f percent",percent)