1. Determine the conditions in which a write-through policy with no fetch on write creates more misses than a write-through policy with fetch on write, given that fetch on write creates 10 per cent higher hit ratio.
2. Determine the average access time in a computer system employing a cache, given that the main memory access time is 125 ns, the cache access time is 30 ns and the hit ratio is 85 per cent. The write-through policy is used and 20 per cent of memory requests are write requests.