Answer:
a-The equation for processor only configuration is
while that for processor and co-processor configuration is
.
b-The value of B is 1.1 second.
c-The value of MFLOPS for co-processor system in configuration 2 is 80 MFLOPS.
d-The evaluation of your colleague is correct.
Step-by-step explanation:
a
The MIPS rating equations are as follows
Configuration 01 (Processor only)

Configuration 02 (Processor + Co-processor)

b
From the equation, for processor and co-processor equation the value of B is calculated. For it to be calculated, the I value is calculated from the processor configuration with the following data F= 8 * 10^6 . Y= 50, W = 4 sec:

Using this value of I gives

The value of B is 1.1 second.
c
The MFLOPS rating of configuration 2 is given as

So the value of MFLOPS for co-processor system in configuration 2 is 80 MFLOPS.
d
The value of W is 4 seconds while the value of B is 1.1 seconds. Despite being the configuration with lower MIPS, the co-processor configuration has a lower execution rate and thus the evaluation of your colleague is correct.