Evan sells skateboards in his store. He marks up the prices by 40% of what he pays for them. If his cost for a gold skateboard is 128.92, how much will he charge his customers for the skateboard?

It would be $180.49 because

1. The cost of the board is 128.92

2. you need to mark up 40%, which is 0.4

3. 128.92 * 0.4 = 51.57, this is the amount you need to mark up by

4. then you add the amount you need to mark up by to the cost of the board: 51.57 + 128.92 = $180.49.

The calculation adds up to 180.488, however i think you might need to round it up to 180.49.