Mr. Silberman has to pay $150 more than Ms. Washington.
Step-by-step explanation: First calculate how much tax Mr. Silberman will have to pay off after 9 months. 50x9=450, so $450 is how much tax he will have to pay. Add that to 1,500, which is the total cost of the computer, which equals $1,950.
Ms. Washington only has to pay $1,800. Mr. Silberman has to pay $1,950. So Mr.  Silberman has to pay more. He has to pay $150 more than Ms. Washington.