What is 77 percent as a fraction in simplest form

This is about circle theorems. someone asap : (

What is the measure of one interior angle of a pentagon

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?