Piano Inc uses the number of music lessons provided as its measure of activity. During April, the company budgeted for 300 music lessons, but its actual level of activity was 295 music lessons. Salary expense is a mixed cost of $4,100 per month plus $34 per music less on salary expense in the planning (static) budget is closest to: A^ \$14 14,300 B. \$14,130 . $ 10,200 D 1 ^ \$4,100