47% of the students in a class of 40 students has glasses or contacts. How many students in the class have either glasses or contacts?
Choose the correct option:
A) 15 B) 16 C) 17 D) 18 E) 19
a=r⋅b   47%=0.47a   =0.47⋅40   a≈19   Option 19 is correct.
<result>E</result>
47% of the students in a class of 40 students has glasses or contacts. How many students in the class have either glasses or contacts?