Isabelle's Gross Pay for the Week Is $850

Isabelle's gross pay for the week is $850. Her deduction for federal income tax is based on a rate of 19%. She has voluntary deductions of $135. Her yearly pay is under the limit for OASDI. What is the amount of her net pay? (Assume a FICA-OASDI Tax of 4.2% and FICA-Medicare Tax of 1.45%.)

A) $553.50
B) $688.50
C) $640.47
D) $505.47