Assume that there are u users connected to the University wireless network to connect to the Internet. u = 1000 during the day, and r = 600 during the night. These users want to brows some Web sites, and the average number of HTTP requests generated by all the users is 0.5 u requests per second. Assume that the size of HTTP request messages is negligible, but each HTTP response message returns an object of size 500 Kbits. If the university is connected to the Internet through a 700 Mbps access link,

(a) What is the percentage of access links capacity consumed by the HTTP response messages during the day and night?

(b) What is the percentage of access links capacity consumed by the HTTP response messages during the day if we use a Web cache which can directly respond to HTTP requests with probability h?