"Percent" means "per hundred", so 10% is 10/100.

10% of 1800 = (10/100)*(1800)

= 10*(1800/100) = 10*18 = 180

10% of 1800 is 180

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"Of" indicates "times"; "per" indicates "divided by".

10 per hundred is 10/100.

10% of 1800 = (10/100)*(1800)

= 10*(1800/100) = 10*18 = 180

10% of 1800 is 180

_____

"Of" indicates "times"; "per" indicates "divided by".

10 per hundred is 10/100.