Please provide an excel sheet that will allow me to easily answer the questions like below?

2)   If the stock price increases above a certain level, P, the percentage margin would drop below the maintenance margin of 25% and you will get a margin call. What is P?

Percentage margin =

3)   If the stock price increases to $95, how much money do you have to add to your account to restore the maintenance margin of 25%?

Let this amount to be X.

Percentage margin =

X=675