3. A system has the following specification: Percentage of instructions accessing memory 36% Main Memory Access Time = 30 ns Size of the Ll cache = 4 KB Ll cache hit rate = 60% L1 hit time = 0.6ns Size of the L2 cache = 10 MB L2 cache hit rate = 20% L2 hit time = 18ns Core frequency = 3.333GHZ Referring to the specification, what is the average memory-access time for the system? Show your calculations. [4 marks]