By selling a shirt at ₹3600, a shopkeeper earned 20% profit. The cost price of the shirt was:
₹3000
When an article is sold at a profit of r%, selling price = cost price × \(\left(1 + \frac{r}{100}\right)\), so cost price = \(\frac{\text{SP}}{1 + \frac{r}{100}}\).
Here SP = ₹3600 and r = 20, so cost price = \(\frac{3600}{1.2} = 3000\).
Therefore the cost price of the shirt is ₹3000.
Check: 20% of 3000 = 600, and 3000 + 600 = 3600, which is the given selling price.
Hence, ₹3000.
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