Ok, so we need to work backwards a little.
If 107.73 includes a 12.5% profit, then 107.73 = 1.125X (where X is the cost to the retail shop)
X = 95.76
Then, the stockist sells at 5% profit so, 95.76 = 1.05X (where X is the cost to the stockist)
X = 91.20
91.20 x 25 strips =$ 2280