The sales totals at robert's food store have increased linearly over the month. which of these best shows the sales in the first three months?
$1200 in the first month, $1212 in the second month, $1224.12 in the third month
$1200 in the first month, $1236 in the second month, $1273.08 in the third month
$1200 in the first month, $1285.48 in the second month, $1370.96 in the third month
$1200 in the first month, $1224.28 in the second month, and $1248.48 in the third month