Answer:
A. $ 24 7/8 
Explanation:
GIVEN:  A stock starts the day at $27 3/8 per share.
 Share drops $2 1/2 during the day.
To Find : Closing value
Solution : first we need to find how many 1/8 are there in 1/2 
So, 

when share drops by $2 then share will be :
$27 - $2 =$25
and 

⇒

⇒

So, 

⇒

So, its closing value is 
 .
.