Sonja is a United States citizen who has worked in Spain for the past 10 months. She received $8,000 a month as compensation. Her employer has offered to extend Sonjas contract to work in Spain for another 6 months at the same rate of pay. If she rejects the offer, she can return to the United States and receive a salary of $10,000 per month. While working in Spain, she is subject to the Spain income tax, which is approximately 11% of her gross pay. The marginal tax rate on her income taxed in the United States is 25%. Compare Sonjas after-tax income assuming she remains in Spain with her after-tax income if she returns to the United States.