The surety bond shall be equal to or greater than the cost of providing a refund for the maximum prepaid, unearned tuition and fees of the school for a period or term during the applicable school year for which programs of instruction are offered, including, but not limited to, on a semester, quarter, monthly, or class basis; except that the period or term of greatest duration and expense shall be utilized for this computation where a school's year consists of one or more such periods or terms.