Selling price of 9 articles is equal to the cost piece of 15 articles. Find the gain or loss percent in the transaction.
Given, selling price (SP) of 9 articles is equal to the cost price (CP) of 15 articles
9 × SP = 15 × CP
∴ SP = 5CP/3
∴ % profit $(= \;\frac{{\frac{{5CP}}{3} - CP}}{{CP}} \times 100\% \; = \;\frac{{200}}{3}\% \; = \;66\frac{2}{3}\% )$