Sam's Souvenirs, Inc. sells souvenirs for $25 each. Sam's pays rent of $140 per month. Its raw materials cost $9 and its direct labor costs $7 for each souvenir. Two of Sam's recent electrical utility bills were as follows: Month May June Electric Utility Bills production output 25 35 cost ($) 115 145 a. What is the mixed cost? b. What is the fixed portion of mixed cost? c. What is the variable portion of mixed cost? d. What is the total fixed cost? e. What is the total variable cost? f. What is her breakeven point, in number of tricycles (per month)