In a memory hierarchy organization with two levels of caches, main memory, and disk assume that: Cache Level L1 has access time Tc|-5 ns and its hit ratio h1= 90%. Cache Level L2 access time Tc2= 20 ns and its hit ratio h2= 80% Main memory access time Tm-80 and its hit ratio h3-60 % Disk access time Td= 1000 ns. . Find average memory access time. Show details of your solution. (15 points)