20% of 1,800 = 360
therefore
1,800 + 360 = 2,160
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1800 + 20% = 1800 x (1 + (20/100)) = 1800 x 1.2 = 2160
You would multiply 1800 by 0.2 (which is 20%) = 360
20 percent of 250 is equal to 50, therefore if you add 50 to 250 you get 300.
175 + 20% = 210
(135 / 3) + (20%) = 54