6.which of the following statement is incorrect?

a. within the relevant rage, total fixed cost remains the same

b. fixed costs per unit remains costant

c. Variable costs per unit remains constant

d. Semi variable cost is also called mixed cost

7.In costing terminology, conversion costs consist of?

a. Direct and indirect labor

b. Direct Labor and direct material

c. Direct labor and factory overhead

d. Indirect labor and variable factory overhead

e. Direct material and factory overhead.