I don't understand this is just for my practice what issue do you see

Barbara is an employee of Baltimore Company. Baltimore Company pays employees the Friday after the wages are earned. Overtime in excess of 40 hours must be paid at 150% of the normal hourly rate.Social Security taxes are 6.2% and Medicare taxes are 1.45%. The federal unemployment tax rate is 1.2% and the state unemployment tax rate is 4.5%. Barbara's wages, including the current pay period, will not exceed the limits for Social Security, Medicare and unemployment taxes.Barbara earns $20 per hour and worked 45 hours for the week ended January 13 , 2019.Baltimore will withhold $220 federal income taxes. determine the total payroll tax expense for Baltimore Company as related to Barbara's earnings.