Her gas is half the price as her $60.00 groceries so that's 60/2 = $<<60/2=30.00>>30.00 in gas
Her card has a balance of $126.00 and she added $60.00 in groceries and $30.00 in gas for a total of 126+60+30 = $<<126+60+30=216.00>>216.00
Her balance is $216.00 and she returns $45.00 worth of merchandise for a new balance of 216-45 = $<<216-45=171.00>>171.00
#### 171