I don't know what kind of financial calculator you use, but I'll explain it with FC200. First, clear the data shift+9 and select all, exe；; Then choose the cash mode, keep the discount rate unchanged, and start to input cash flow from csh. Take your first title as an example: the first issue-950; Then the second phase is 700,550 until130; Esc returns to the previous interface; Select irr；; Point solution; ; You can get results; If you don't understand, you can keep asking.