47% of the students in a class of 38 students has glasses or contacts. How many students in the class have either glasses or contacts?	Select the correct option.
A) 15
B) 16
C) 17
D) 18
E) 19
a=r⋅b   47%=0.47a   =0.47⋅34   a≈18   Option 18 is correct.
<result>D</result>
47% of the students in a class of 38 students has glasses or contacts. How many students in the class have either glasses or contacts?