If the total sales$-$volume manufacturing cost variance was $$20,000$ unfavourable, and the total fixed overhead cost variance was $$12,500$ favourable, then the total flexible$-$budget manufacturing cost variance must have been: Select one:

a$.$

$$32,500$ unfavourable.

cross out

b$.$

$$7,500$ favourable.

cross out

c$.$

$$7,500$ unfavourable.

cross out

d$.$

undeterminable.