If you sell tacos for $4, when they had a production cost of $2, this is a markup percentage of 100%.
This can be found by the formula:
= (Selling price - Cost price) / Cost price x 100%
Solving gives:
= (4 - 2) / 2 x 100%
= 2 / 2 x 100%
= 1 x 100%
= 100%
In conclusion, the markup is 100%.
Find out more on markup percentages at https://brainly.com/question/14325055.