The CPU of a movie streaming server has L1 cache reference of 0.5 s and main memory reference of 100 ns. The L1 cache hit during peak hours was found to be 23% of the total memory references.

1. Calculate the cache hit ratio h.

2. Find out the average time (Tavg) to access the memory.

3. If the size of the cache memory is doubled, what will be the impact on h and Tavg.

4. If there is a total failure of the cache memory, calculate h and Tavg.