Answer:
At february 10th the price was $18
Explanation:
If there was an increase of 275%, then the final price is the original price (100%) added by the amount increased, therefore it is 375% of the original value. In order to calculate how much that is we can apply a rule of three in a way that $67.5 is realated to 375% in the same proportion as 100% is related to "x", where this variable is the price in february 10th.
$67.5 -> 375%
$x -> 100%
67.5/x = 375/100
375*x = 67.5*100
375*x = 6750
x = 6750/375 = 18
At february 10th the price was $18