4.Dewberry Midwifery's cost formula for its wages and salaries is $1,960 per month plus $429 per birth. For the month of December, the company planned for activity of 128 births, but the actual level of activity was 130 births. The actual wages and salaries for the month was $56,020. The wages and salaries in the flexible budget for December would be closest to: a. $56,872 b. $57,761 c. $56,020 d. $57,730