please show brief explanation

22. Consider a program with 2,000 load and store instructions, 1500 of these data values are found in cache. The rest are supplied by other levels of memory hierarchy. The miss rate for the cache is: A. 0.75 B. 0.25 C. 250 D. 500 23. Suppose a program has 2 levels of hierarchy: cache and main memory. If the cache time = 2 cycle, penalty time to access the main memory = 50 cycles, and hit rate for the cache = 0.5 then the AMAT is: A. 2.7 cycles B. 7.2 Cycles c. 27 Cycles D. 72 Cycles 24. Accessing the stack will be always faster than accessing the memory. A. True B. False