(iv) for the two thousand fourteen--two thousand fifteen, two thousand fifteen--two thousand sixteen and two thousand sixteen--two thousand seventeen school years, the charter school basic tuition shall be the sum of the lesser of the charter school basic tuition computed for the two thousand ten--two thousand eleven school year pursuant to the provisions of subparagraph (i) of this paragraph or the charter school basic tuition computed for the current year pursuant to the provisions of subparagraph (i) of this paragraph plus the supplemental basic tuition.
For the purposes of this subdivision, the "supplemental basic tuition" shall be (A) for a school district for which the charter school basic tuition computed for the current year is greater than or equal to the charter school basic tuition for the two thousand ten--two thousand eleven school year pursuant to the provisions of subparagraph (i) of this paragraph, (1) for the two thousand fourteen--two thousand fifteen school year two hundred and fifty dollars, and (2) for the two thousand fifteen--two thousand sixteen school year three hundred and fifty dollars, and (3) for the two thousand sixteen--two thousand seventeen school year five hundred dollars, and (B) for a school district for which the charter school basic tuition for the two thousand ten--two thousand eleven school year is greater than the charter school basic tuition for the current year pursuant to the provisions of subparagraph (i) of this paragraph, the positive difference of the charter school basic tuition for the two thousand ten--two thousand eleven school year minus the charter school basic tuition for the current year pursuant to the provisions of subparagraph (i) of this paragraph.