A CPU accesses 100 program instructions. Each memory access takes 5 nanoseconds (ns, or billionths of a second). All 100 instructions are in memory. What is the total time in ns?

Answer 1

To calculate the total time it takes for the CPU to access 100 program instructions, we can follow these steps:

1. Each memory access takes 5 nanoseconds.
2. The CPU accesses 100 instructions.

Now, we multiply the number of instructions by the time taken for each access:

\[ \text{Total time} = \text{Number of instructions} \times \text{Time per access} \] \[ \text{Total time} = 100 \text{ instructions} \times 5 \text{ ns/instruction} = 500 \text{ ns} \]

Thus, the total time for the CPU to access 100 instructions is 500 nanoseconds (ns).