Answer:
a. The net pay is correct. 
Explanation:
Suppose the missing part of the question which is the gross pay and the federal tax is 1020.00 and 107.00 respectively. 
Then, Social Security tax 6.2% of the gross pay = 
 Social Security tax 6.2% of the gross pay  = 0.062 × 1020
 Social Security tax 6.2% of the gross pay  = $63.24
the Medicare tax is 1.45% of gross pay = 
the Medicare tax is 1.45% of gross pay = 0.0145  × 1020
the Medicare tax is 1.45% of gross pay =  $14.79
the state tax is 19% of federal tax = 
the state tax is 19% of federal tax = 0.19 × 107
the state tax is 19% of federal tax = $20.33
Hence, to determine if Juanita's net pay is correct, we have the summation of all our estimated figures minus the gross pay.
i.e 
Juanita's net pay = $1020 - $(107 + 63.24 + 14.79 + 20.33) 
Juanita's net pay =  $1020 - 205.36 
Juanita's net pay =  $814.64