47% of the students in a class of 44 students has glasses or contacts. How many students in the class have either glasses or contacts? Choose the correct choice: A) 15 B) 16 C) 17 D) 18 E) 21
a=r⋅b   47%=0.47a   =0.47⋅34   a≈21   Option 21 is correct.
<result>E</result>
47% of the students in a class of 44 students has glasses or contacts. How many students in the class have either glasses or contacts?