Begin by subtracting your downpayment from your initial balance of $2,625 for the computer as given in the question.
> $2,625.00 (given) - $50.00 (given) = $2,575 (answer)
The amount remaining, which is $2,575 after the down payment, will be the amount due to pay off over 10 monthly equal payments. 10 monthly equal payments is a given in this word problem.
By stating "equal" in the question, we know we can divide our remaining amount of $2,575 by 10 monthly payments and get the answer to what Sam will pay monthly with all of the payments being equal.
> $2,575/10 payments = $257.50
The math gives us a solution of $257.50 to pay each month for ten months for Sam to pay for the new computer.