As a source of income after retirement, Ian Donnelly sells an assortment of hard-to-find, specialty hardware items out of his home. Ian buys a pair of small "ratchet-style" pruning clippers for $15 each and sells them for $45 each. What is the markup percent based on selling price?

Ratchet-Style

A mechanism or approach that permits only incremental increases or improvements, often without the possibility of reversal.

Pruning Clippers

Gardening tools used for cutting and shaping plants by removing unnecessary or unwanted parts.

Markup Percent

The percentage increase in the selling price of goods beyond their cost, used by retailers to achieve a profit margin.