used for each unit of finished product are as follows:

Material A $0\mathrm{.}50lb.$ per unit @ $$0\mathrm{.}72$ per pound

Material B $1\mathrm{.}00lb.$ per unit @ $$2\mathrm{.}04$ per pound

Material C $1\mathrm{.}20lb.$ per unit @ $$0\mathrm{.}87$ per pound

The dollar amount of Material C used in production during the year is

a$.$ $$764,208$

b$.$ $$636,840$

c$.$ $$573,156$

d$.$ $$700,524$