Problem similar to $1\mathrm{.}12$:

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Consider a memory system with the following parameters:

Tc $=100$ ns Cc $=0\mathrm{.}01$ cents$/$bit

Tm $=1,200$ ns Cm $=0\mathrm{.}001$ cents$/$bit

a$.$ Explain why the cost of $1$ MByte of main memory is $$80.$

b$.$ Explain why the cost of $1$ MByte of main memory using cache memory technology is $$800.$

c$.$ If the effective access time is $10\%$ greater than the cache access time,

explain why the hit ratio H is $99\mathrm{.}167\%.$