please help! I'm not good at these types of problems 
A recent social survey asked respondents whether they like Apple or Microsoft. The responses were recorded in the following table.
 a. A respondent is randomly selected among those that prefer Apple, what is the probability that the respondent will be female?
b. A respondent is randomly selected among those that are Male, what is the probability that the respondent prefers Apple?
c. What is the relative frequency of a female who prefers Microsoft?
                                             
                                          
                                          
                                        
											 
			                  