In a particular library there are 5 computer clusters open for public use. Each Computer Clusters has 40 Tablets. In the 1st week, 75 tablets are used, while 155 tablets are used in the second week, 30 in the third week & 140 in 4th week. Approximately what fraction of the library's computer facilities are in use per month?  Choose the correct choice from the following answers.
A) 1/3 B) 1/4 C) 1/2 D) 2/3 E) 2/5
Total number of tablets = 40*5= 
<gadget id="calculator">40*5</gadget>
<output>200</output>
200   Fraction of library's computer facilities used,   1st week= 75/200 = 3/8   2nd week = 155/200 = 31/40   3rd week = 30/200 = 3/20   4th week = 140/200 = 7/10   Fraction of library's computer facilities used per month   = (3/8+31/40+3/20+7/10)/4   =1/2   ANSWER:1/2
<result>C</result>
In a particular library there are 5 computer clusters open for public use. Each Computer Clusters has 40 Tablets. In the 1st week, 75 tablets are used, while 155 tablets are used in the second week, 30 in the third week & 140 in 4th week. Approximately what fraction of the library's computer facilities are in use per month?