Q5. Assume that the bank would like to offer a promotion in efforts to retain long standing
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Q5. Assume that the bank would like to offer a promotion in efforts to retain long standing customers by cash prizes. If a customer has been with the bank for over 36 months the bank will deposit 4% of the customers total cash at the bank (checking + saving) to the customers' checking account. Create new column called "After promotion" which calculates the amount in checking account for each customer after the promotion.
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