Consider two different machines, with two different instruction sets, both of which have a clock rate of 100 MHz. The following measurements are recorded on the two machines running a given set of benchmark programs:

Instruction Type	Instruction count (million)	Total cycles consumed for instructions in Column 2 (million)
Machine A
Arithmetic	7	7
Load and Store	4	12
Branch	2	8
Others	4	12
Machine B
Arithmetic	10	10
Load and Store	8	16
Branch	3	9
Others	4	16

(a). Determine the average CPI, MIPS, and execution time for each machine.

(b). What is a better measure of performance and why?