How did they get .8% increase?

Step-bystep explanation A) Need of blueprints = 36 per hour. Architects create blueprints = 3 per hour and demand for $39.83 per hour After hiring of 3 drafter, they create only 2 blueprints per hour and demand for $28.93 per houn Now if we look for unit work then, If an architect take $39.83 per hour for 3 blueprints then 1 blueprints cost the company should pay is $13276. Whereas after hiring of new drafter the company have to pay $14.465 for 1 blueprints although these drafter create only 2 blueprints per hour. Taking out difference of the the unit work which is coming out($14.465 -$13.276 = $1.189).Hence there is loss of $1.189 after the hiring of new drafter. B)Yes after hiring the 4 drafter with salary of $25.95 the company will save money because for drafter the unit work salary is $12975 as compare to architects for whom the salary is about increase 0.8% that is. 0.8*present unit salary of architect. = O.8*$39.83 =$0.31 increase on $39.83. Therefore architect will get $40148