The table below shows some of Brian's monthly expenses from July to December. JulyAugustSeptemberOctoberNovemberDecember Internet access$141 $141 $141 $141 $141 $141 Credit card$161 $199 $232 $389 $257 $302 Groceries$137 $341 $332 $309 $271 $100 Transportation$245 $89 $177 $269 $157 $218 Mortgage payment$1241 $1241 $1241 $1241 $1241 $1241 For each expense below, choose whether it is fixed or variable. Fixed expenseVariable expense Internet access Credit card Groceries Transportation Mortgage payment