$29.30 per period.
According to the tax table for 2017. A taxable income of $7000 will have a tax of $703. 703/24 = 29.29 per paycheck round up my 1 cent to 29.30 to cover the additional 4 cents left over and recieve a 20 cent refund. Source https://www.irs.gov/pub/irs-pdf/i1040tt.pdf
You can write this ratio in two other ways:
7 to 13
7 : 13
