Answer:
b & d
Step-by-step explanation:
-8 and -9 because it is negative
Manny can assemble a computer in 50 minutes. That means, in a minute Manny does

job.
Lucy can assemble a computer in 45 minutes. That means, in a minute Lucy does

job.
If they are working together, in a minute they will do:



In a minute they will do

job
To finish the job they will do it in
minutes or about 24 minutes.
A. $90
150 x .40= 60
150-60=90