In October, Seville Chemicals produced $28,500$ barrels of the additive. Manufacturing overhead was $$345,000,$ and the cost per barrel was $$16\mathrm{.}31.$ Materials costs were four times greater than labor costs.

Required:

a$.$ What were the labor costs for October?

b$.$ What were the materials costs for October?

a$.$ Labor costs for October

b$.$ Materials costs for October