20ns The following table summarizes some relevant parameters relating to the memory system: Cache (SRAM) Access Time DRAM Access Time - best case (see comment below) DRAM Cycle Time - worst case (see comment below) Cache Hit Rate Cache Block Size 60ns per word 130ns per word 95% 16 words Calculate the average memory access time assuming that the main memory (DRAM) can be operated at its maximum possible speed, i.e. 60ns per word 60% of the time, and at 130ns per word 40% of the time. Hint: Make a tree diagram.