What is a set amount of pay you receive by a worker over the course of a year

Gretta needs a $300,000 mortgage and is offered two choices. the monthly payments for the fixed rate and predicted payments for the arm are shown. adjustable rate mortgage year monthly payment 1-15 $1,610.46 adjustable rate mortgage year monthly payment 1-5 $1,520.06 6-15 $1,728.54 what is the difference between the total costs of the mortgages rounded to the nearest hundred? $8,700 $1,700 $15,800 $5,000