Answer:2764800
Step-by-step explanation:First step is to convert feet into inches:
1 foot = 12 inches
20feet = 20*12=240 inches
8feet = 8*12=96 inches
Now we can calculate total area:
A = height * width
A= 240 * 96
A=23040 inches²
We know the amount per one inch² and we need to find out total number of blades:
1 inch² 120 blades
23040 inches² x blades
Now we cross-multiply numbers:
1*x = 23040 * 120
x= 2764800
There are total of 2764800 blades in the entire law