Question

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%

This question was addressed to me in a national level competition.

My doubt stems from Symbol Table Organization in division Symbol Table of Compiler

Answer 1

Right choice is (b) 90%

The explanation is: The answer is 90%.