To figure out what 215% of 18 is you just multiply 2.15 x 18 = 38.7
calculating percentages involve representing those percentages as fractions with denominator being a hundred or aa decimals. 215% represented as fraction becomes 215/100. As decimal it becomes 2.15. The operand "of" is in its basic form, multiplication. 215/100 [2.15 of 18] of 18 becomes 215/100 x 18 [2.15 x 18] which on working out gives you 38. 7 as the correct answer.
To estimate 215% of 18, first convert 215% to a decimal, which is 2.15. Then multiply 2.15 by 18, giving you an estimate of 38.7. Therefore, 215% of 18 is approximately 38.7.
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