The standard costs and actual costs for direct materials for the manufacture of $2,500$ ?actual units of product are as follows:

Standard Costs

Direct materials $1,040$ ?kilograms at $$8\mathrm{.}89$

Actual Costs

Direct materials $,2,500$ ?kilograms at $$8\mathrm{.}25$

The direct materials price variance is

$?$ ?a$.$ ?$$1,600$ ?unfavorable

b$.$ ?$$1,600$ ?favorable

c$.$ ?$$666$ ?unfavorable

d$.$ ?$$666$ ?favorable