Collateral & borrow fee calculations when shorting stocks

Hi, can anyone help me find answers to the questions?

In a short sale of stocks, the seller must pay a borrow fee every day and post a collateral to the lender. The calculation of these borrow fees and collaterals depends on the prior business day's close price.

Question 1: What day's closing price is used to determine a borrow fee for Sunday? Is it Friday or Thursday?

Question 2: Let's assume Wednesday is a holiday when there is no trade. What day's closing price is used to determine a borrow fee for Wednesday? Is it Tuesday or Monday?

Question 3: What day's closing price is used to determine a collateral for Sunday? Is it Friday or Thursday?

Question 4: Let's assume Wednesday is a holiday when there is no trade. What day's closing price is used to determine a collateral for Wednesday? Is it Tuesday or Monday?
 
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