pls do it step by step thanks

7. Consider a system with a main memory access time of 100ns supported by a cache having a 8ns access time a. [3 pts] access to cache and main memory occur concurrently? Give your answer to two decimal places b. [3 pts] access to cache and main memory occur sequentially? Give your answer to two decimal places and a hit rate of 98%. What is the effective access time (EAT) in nanoseconds if to the right of the decimal point. to the right of the decimal point