Agallery owner purchased a very old painting for $3000 to painting sells at 325% increase in price and use of retail price of the painting

If you asking for the price after the increase, you have to turn the percent into a decimal:

325% ---> 3.25

Then multiply the price to the percent:

3000 x 3.25 = 9750

Then add that to the original cost:

3000 + 9750 = 12,750 

So the person would be selling it at $12,750

Hope this helps!