3M libor +270-300, understood from the text as the quotation of foreign exchange funds, is generally implemented only for loans, that is, based on the loan withdrawal date (generally, the contract indicates that the libor value date is the three-month libor value corresponding to the London interbank offered market two working days before the withdrawal date, plus 270BP or 300BP, that is, 2.7% or 3% after the LIBOR value is taken. The other party's quotation is an interest rate range. If the LIBOR for the current three months is 0.4 and the back boundary is 270-300BP, the final interest settlement result is to calculate the interest every three months, with the loan principal multiplied by (2.7+0.4)% as the lower limit and the loan principal multiplied by (3.0+0.4)% as the upper limit. Each interest period is three months, and the loan interest rate fluctuates due to different libor values. I hope it has reference significance for your work.