Please give me a step by step on how to complete this on ti $84$ calculator $.$ please give me the correct answer to the incorrect part. Problem $11-16($Algo$)$

Lieutenant Commander Data is planning to make his monthly $($every $30$ days$)$ trek to Gamma Hydra City to pick up a supply of isolinear

chips. The trip will take Data about three days. Before he leaves, he calls in the order to the GHC Supply Store. He uses chips at an

average rate of twelve per day $($seven days per week$)$ with a standard deviation of demand of two per day. He needs a $99$ percent

service probability.

a$.$ If he currently has $20$ chips in inventory, how many should he order?

Note: Use Excel's NORM.S$.$INV$()$ function to find the $z$ value. Round $z$ value to $2$ decimal places and final answer to the nearest

whole number.

Answer is complete and correct.

b$.$ What is the most he will ever have to order?

Note: Use Excel's NORM.S$.$INV$()$ function to find the $z$ value. Round $z$ value to $2$ decimal places and final answer to the nearest

whole number.

Answer is complete but not entirely correct.

Maximum order quantity