If 15 students in a class average 80% on an English exam and 10 students average 90% on the same exam, what is the average in percent for all 25 students?  Choose the correct choice from the following answers
A) 83%
B) 83 1⁄2%
C) 84%
D) 85%
E) 86 2⁄3%
The average percentage = (15 x 80% + 10 x 90%)/25   = (15 x 80% + 10x 80% + 10x10%) / 25 ......(as 90% = 10% + 80% )   =(25x80% + 10x10%)/25   = 80% + 10x10%/25   = 80% + 4%   = 84%   ANSWER:84%80  + 4= 
<gadget id="calculator">80  + 4</gadget>
<output>84</output>
84%   ANSWER:84%
<result>C</result>
If 15 students in a class average 80% on an English exam and 10 students average 90% on the same exam, what is the average in percent for all 25 students?