Kirby Fasteners supplies the electronics industry with accessories for cases, disc enclosures, and so on$.$ Below are the costs and volumes for the past six months at its Plant number $6$:

Required:

a$.$ Use the high$-$low method to estimate the monthly fixed cost of production and the variable cost of production per unit.

b$.$ Kirby analysts forecast a production level of $12,700$ units in July. Based on the results from requirement $($a$),$ what would be the estimated production costs in July?