Explanation:
Let the original price be x
After increasing by 20% the price is 3000
Thus,
x + ( x × 20%) = 3000
x + 20x/100 = 3000
x + x/5 = 3000
(5x + x)/5 = 3000
6x/5 = 3000
x = 3000 * 5/6
x = 2500
Hope it helps :)
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