Multiply it by 9 and then divide the answer by 10.
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9/10 of 3 = 2.7
9 tenths = 9/10 = 9 ÷ 10 = 0.9
You figure what two tenths of one percent of an amount is by multiplying that original amount by 0.002 The result is two tenths of a percent of that amount.
3 and 9 tenths = 3.9
The 9 represents tenths, and its value is 9/10 (nine-tenths).