Easy data structure and algorithm practice puzzle.
Given [cost, markupPercent], return the selling price, rounded to a whole number. Add cost x markupPercent / 100 to the cost. So [80, 25] is 80 + 20 = 100. Markup is measured against COST, and margin is measured against price, which is why a 100 percent markup is only a 50 percent margin.
Solve it three ways: snap the jigsaw pieces together, fill in the blanks, or type it from scratch against the tests. This one is free.
Every line of the solution comes with a note explaining why it is there, and a step by step replay shows the code running. At level 3, where you type it yourself, you can ask for an AI mock interview on this problem that ends with a hiring manager's scorecard.
Then grow it into a real project with the Software Engineer button: this puzzle becomes the Trade Audit Trail, a pipeline you can run and download. See every Software Engineer project.
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