When investigating the bank loan effect to people, investigators found the following facts. The earnings of

people who applied for the loan and get approved earned $$5,000$ annually. The earnings of people who

applied for the loan if they had not been approved would have been $$4,000$ annually. The people who did

not apply for the loan and did not get approved earned $$3,200$ annually. The people who did not apply for

the loan but received the bank loan credit earned $$4,300$ annually. Based on the above information, please

calculate:

$(1)$ The true causal impact of bank loan $(2$ Points$).$ Round your answer to two decimals.