Example. On July 1, 1970, A, a single person who is on a weekly payroll period and claims one exemption, receives wages of $100 from X Co., his employer. X Co. multiplies the weekly wage of $100 by 52 weeks to determine an annual wage of $5,200. It then subtracts $650 for A's withholding exemption and arrives at a balance of $4,550. The applicable table in section 3402(a) for annual payroll periods indicates that the amount of tax to be withheld thereon is $376 plus $314.50 (17 percent of excess over $2,700), or a total of $690.50. The annual tax of $690.50, when divided by 52 to arrive at the portion thereof attributable to the weekly payroll period, equals $13.28. X Co. may, if it chooses, withhold $13.28 rather than the amount specified in section 3402 (a) or (c) for a weekly payroll period.