I need help with this question on Operating System

10 - Answer the following questions about cache memory using a computer system with the following characteristics: Total Memory Requests: 5000, Memory Requests Found in Cache: 3500, Average Main Memory Access Time: 1000 nsec, and Average Cache Memory Access Time: 200 nsec.

a) What is the Hit Ratio for the system?

b) What is the Average Memory Access Time for the system?

c) Explain why is the Average Cache Memory Access Time is a constant value in the Average Memory Access Time formula.

d) Explain why is the Average Main Memory Access Time is dependent on the Hit Ratio value in the Average Memory Access Time formula.

e) What affect, if any, would doubling the available cache memory have on the Average Memory Access Time?

Thank you.