In a computer with cache hit rate of 95% where the cache access time is 100 ns and the memory access time is 1000 ns: a) Find the miss ratio b) Find the average access time c) Find the improvement in performance where time to access main memory is 1000 (nanoseconds) and time to access cache is 100 (nanoseconds) Question 4: A cache memory needs an access time of 30 ns and main memory 150 ns, what is the average access time of CPU (assume hit ratio = 80%)?