Gribble Company$$s high and low level of activity last year was $60,000$ units of product produced in May and $20,000$ units produced in November. Machine maintenance costs were $$156,000$ in May and $$60,000$ in November. Using the high$-$low method, determine an estimate of total maintenance cost for a month in which production is expected to be $45,000$ units.

Group of answer choices

$$135,000$

$$144,000$

$$117,000$

$$120,000$