SRAM costs about $500 per GB while 16 GB of DRAM costs $100 today. consider scenario where the SRAM has an average access time of 2 ns while the DRAM has an average access time of 50 ns. if we are able to design a cache memory system with 1 MB of SRAM, 16 GB of DRAM and hit rate of 90% what would be the improvement in price/performance ratio?