Final answer:
To determine the mark-up price for each trinket, add the operating cost and the desired profit to the cost of each item. The mark-up price for each trinket is the cost + operating cost + desired profit. The selling price for each trinket is the mark-up price.
Step-by-step explanation:
To determine the mark-up price for each trinket, we need to add the operating cost and the desired profit to the cost of each item.
Let's assume that the cost of each trinket is PHP 12.
a. The operating cost is 25% of the cost, which is 0.25 * 12 = PHP 3.
The desired profit is 15% of the cost, which is 0.15 * 12 = PHP 1.80.
The mark-up price for each trinket is the cost (PHP 12) + operating cost (PHP 3) + desired profit (PHP 1.80), which is PHP 12 + 3 + 1.80 = PHP 16.80.
b. The selling price for each trinket is the mark-up price (PHP 16.80).