An executive in an engineering firm earns a monthly salary plus a Christmas bonus of 6400 dollars. I

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An executive in an engineering firm earns a monthly salary plus a Christmas bonus of 6400 dollars. If she earns a total of 87400 dollars per year, what is her monthly salary in dollars?

Calculate the annual salary without bonus:
Annual Salary = Total Pay - Christmas Bonus
Annual Salary = 87400 - 6400
Annual Salary = 81000

Now calculate the monthly salary. Note: there are 12 months in a year:
Monthly Salary = Annual Salary / 12
Monthly Salary = 81000/12
Monthly Salary = 6750