The debtor is entitled to an exemption from levy of the greater of the following: a.
(a)#
A subsistence allowance of 75 percent of the debtor’s disposable earnings then due and owing.
(b)#
An amount equal to 30 times the federal minimum hourly wage for each full week of the debtor’s pay period; or, in the case of earnings for a period other than a week, a subsistence allowance computed so that it is equivalent to that amount using a multiple of the federal minimum hourly wage prescribed by the department by rule.