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The task. On January 15, it is planned to take a bank loan for 19 months. The conditions for his return are:
- on the 1st of each month, the debt increases by r% compared with the end of the previous month;
- from the 2nd to the 14th day of each month, it is often necessary to pay the debt;
- On the 15th day of each month, the debt must be one and the same amount less than the debt on the 15th day of the previous month.
It is known that the total amount of payments after the full repayment of the loan is 30% more than the amount taken on credit. Find r.
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