Your data is correct. You start each month with a base of 30. Last month you used 17. That left 13 to roll over. Add that to your base of 30=43. If you use 20 or those 43 this month, only 10 will roll over to next month (30 minus 20= 10).
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Your data is correct. You start each month with a base of 30. Last month you used 17. That left 13 to roll over. Add that to your base of 30=43. If you use 20 or those 43 this month, only 10 will roll over to next month (30 minus 20= 10).