the selling price is $122.40 the mark up is 80% what is the cost to the store

1.8x = 122.4

x = $68.00

To find the cost to the store, we need to reverse the mark-up percentage calculation. The mark-up percentage represents the increase from the cost to the selling price.

Here's how you can calculate it step by step:

Step 1: Convert the mark-up percentage to a decimal. Divide the mark-up percentage by 100.

Mark-up percentage = 80% = 80/100 = 0.8

Step 2: Calculate the cost to the store.

Cost = Selling price / (1 + Mark-up percentage)

Cost = $122.40 / (1 + 0.8)

Cost = $122.40 / 1.8

Cost = $68

Therefore, the cost to the store is $68.