Answer:
wages expense  320,000 debit
               cash                                     218,400 credit
               FICA tax payable                     2,160 credit
              SUTA tax payable                       240 credit
               Social security payable        24,000 credit
              wages income tax payable   75,200 credit
--to record July 15th payment to employees wages--
payroll tax expenses   26,400  debit
FICA tax payable                     2,160 credit
SUTA tax payable                       240 credit
Social security payable        24,000 credit
---to record the payroll tax for the week ended July 15th--
Explanation:
We multiply the wages subjet to taxation by each rate:
social security:
320,000 x 7.5% = 24,000
SUTA
40,000 x 5.4% = 2,160
FICA
40,000 x 0.6% =    240
For this three concepts, the employee will have liability for the same amount for payroll taxes 
Income tax 75,200
net wages: 320,000 - 24,000 - 2,160 - 240 - 75,200 = 218,400