For a $4-$level cache and one main memory system, if the hit$-$ratio of level$-1$ cache is $40\%$ and access time is $20ns,$ the hit$-$ratio of level$-2$ cache is $30\%$ and access time is $100ns,$ the hit$-$ratio of level$-3$ cache is $20\%$ and access time is $400ns,$ the hit$-$ratio of level$-4$ cache is $5\%$ and access time is $600ns,$ and the access time of main memory $1000ns,$ what are CEAT and NEAT?