Each eligible individual who is unemployed in any week, as defined in Section 239, shall be paid, with respect to such week, a benefit in an amount equal to his weekly benefit amount (plus dependents’ allowances) less that part of wages (if any) payable to him with respect to such week which is in excess of 50% of his weekly benefit amount, provided that such benefit for any benefit week shall be reduced by: (1) the amount of any holiday pay which the individual is entitled to receive, and receives, for any workday in such week, and (2) the amount of any vacation wages allocated to such week by the individual’s employer pursuant to Section 610 of this Act, and (3) one-fifth of the weekly benefit amount for each normal workday during which such individual is unable to work or unavailable for work, and provided, further, that this subsection shall not be construed so as to effect any change in the status of part-time workers as defined in Section 407. Such benefit, if not a multiple of $1, shall be computed to the next higher multiple of $1.