If memory access takes 20 ns with cache and 110 ns without it, then the ratio(cache uses a 10 ns memory) is _____.

If memory access takes 20 ns with cache and 110 ns without it, then th

1.	If memory access takes 20 ns with cache and 110 ns without it, then the ratio(cache uses a 10 ns memory) is _____.
A.	93%
B.	90%
C.	88%
D.	87%
Answer» C. 88%