K$-$Too Everwear Corporation can manufacture mountain climbing shoes for $$14\mathrm{.}7$ per pair in variable raw material costs and $$11\mathrm{.}38$ per pair in variable labor expense. The shoes sell for $$110$ per pair. Last year, production was $120,000$ pairs. Fixed costs were $$810,000.$

a$.$ What were total production costs?

b$.$ What is the marginal cost per pair?

c$.$ What is the average cost?

d$.$ If the company is considering a one$-$time order for an extra $10,000$ pairs, what is the minimum acceptable total revenue from the order?