Insurance Claims homework help

The patient undergoes arthroscopic surgery at an ambulatory surgical center. The surgeon’s fee is $890. The patient’s coinsurance is 20% of the $700 fee schedule. No deductible or copayment applies.
a. Enter the amount the patient pays the provider: ________140$_______
b. Enter the amount the payer reimburses the provider: ____560$_______
c. Enter the amount the provider “writes off” the account: __190$_______

As you can see, I have already answered the question. I was hoping someone could verify my answers though.