Sentence:  There shall be deducted from the amount of each payment made pursuant to subsection ( c ) of section 8 , as reimbursement for the expenses incurred by the United States , an amount equal to 5 <WSD>per</WSD> centum of such payment . 
Meaning of the word marked with <WSD> tags:  a proportion in relation to a whole (which is usually the amount per hundred)