Please explain

6. Consider a memory system with the following parameters: Tc = 100 ns, Tm = 1200 ns, Cc = 0.01 cents/bit, Cm 0.001 cents/bit (1) What is the cost of 1 MByte of main memory? (2) What is the cost of 1 Mbyte of main memory using cache memory technology? (3) If the effective access time is 10% greater than the cache access time, what is the hit ratio H