Three sets of 70, 50 and 60 students appeared for an examination and the pass percentage was 100, 90 and 100 respectively. the pass percentage of the whole set is  Choose the correct choice from the following answers
A) 97.4%	B) 97.9%	C) 97.6%	D) 97.2%	E) 97.5%
Explanation:   total passed student =70+45+60= 
<gadget id="calculator">70+45+60</gadget>
<output>175</output>
175   175 is 97.2% of 180   ANSWER:97.2%
<result>D</result>
Three sets of 70, 50 and 60 students appeared for an examination and the pass percentage was 100, 90 and 100 respectively. the pass percentage of the whole set is