Question:
If a machine is supplied with power at a rate of [tex]$4,000 \, \text{W}$[/tex], and it does useful work with a power of [tex]$1,900 \, \text{W}$[/tex], what is the efficiency of the machine?
Answer Options:
Select one:
A. Efficiency [tex]= 80 \%[/tex]
B. Efficiency [tex]= 47.5 \%[/tex]
C. Efficiency [tex]= 195 \%[/tex]
D. Efficiency [tex]= 2.1 \%[/tex]