A company sells 500 sleds per month for $80. Variable costs are $41 per unit and fixed expenses are $3,500 per month. The company thinks that using a new material would increase sales by 70 units per month. If the new material increases variable costs by $4 per unit, the impact on contribution margin would be a .

Portia grant is an employee who is paid monthly. for the month of january of the current year, she earned a total of $8,388. the fica tax for social security is 6.2% of the first $118,500 earned each calendar year and the fica tax rate for medicare is 1.45% of all earnings. the futa tax rate of 0.6% and the suta tax rate of 5.4% are applied to the first $7,000 of an employee's pay. the amount of federal income tax withheld from her earnings was $1,391.77. what is the total amount of taxes withheld from the portia's earnings?