To calculate the cost of each bottle, we need to divide the total cost by the total of bottles.
That's $7.41/3 = $2.47
If the cost of each bottle were, for example, $1.62 per bottle, the cost of 3 bottles would be 3*$1.62= $4.86, and that's not correct because we know that the cost of 3 bottles is $7.41.
