A Laundromat owner bought eleven new washing machines and eight new dryers. He paid the same amount for a dryer as for a washer. His final cost was $10,450. What was the cost per machine?

Let the cost of drier and machine be 'x'
so,

11x+8x=10,450
x=550

the answr is $550

A consumer bought two items on credit with zero interest for set monthly payments of $250 and $90. Both items were financed for the same length of time. How long would it take to pay them off if the total amount of the combined purchases was $3,060?