Q$19.$ A supplier has quoted a $$1$ total labor cost per unit for a part. You have learned that the suppler's ratio of direct labor to indirect labor is $1\mathrm{.}5$ to $1.$ What is the part's direct labor cost per unit?

$1)$ $$0\mathrm{.}504)$$$10$

$2)$ $$2\mathrm{.}255)$$$1\mathrm{.}50$

$3)$ $$0\mathrm{.}606)$ $$0\mathrm{.}9$