Determine the ATP for week $2$ when the forecast for each period is $70$ units. The production lot size is $100$ units, and the starting inventory is O$.$ Use the below table for customer order against each period:

Period

$1$

$2$

$3$

$4$

Customer orders

$80$

$50$

$30$

$10$

$60$ units

$50$ units

$30$ units

$20$ units