Pretty sure this is the formula:

Average time = TL1 * HR + (TL1 + TL2) * FR

so the answers are there i'm just want to know how to get them. I need to do this with a similar, but different, question later.

4.Calculate the access time of the level 1 and level 2 of the memory of the following two- level memory system. (10 points). Average time to read a word from memory- 200 ms TL1+TL2 1100 Failure ratio = 10% Time to find a word in any level of the memory (0 ms). TL1 100 ms TL2 1000 ms