$Total channel load = \frac{Total number of request / second}{Total number of slots / second}$
As average station makes 36 request / hour. So each station makes a request every 3600 sec / 36 request = 100 sec.
Total load is 10000 requests per 100 sec, i.e., 10000 / 100 = 100 request per second.
Number of slots in 1 second = 1 sec / 100 microsec = 10000 slots per second.
$Total channel load = \frac{100}{10000} = \frac{1}{100}$