Answer:
$1.73
Explanation:
To get the price of one bottle, set up a proportion.
let x = the price of one bottle
the numerator will be the price of the bottles and the denominator will be the number of bottles.
6.90 / 4 = x / 1
cross multiply: 6.90 = 4x
solve for x by dividing by 4 on both sides
6.90/4 = 4x / 4
x = 1.725, round up to $1.73