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180 nickels into dollars is 9 dollars. This is because the ratio of nickels to dollars is 1:0.05. So 180 multiply by 0.05 = to 9 dollars.
180 billion dollars
You cannot write it as a percent until you know what part it is of a whole. However, if we assume that 180 is the only number, then it is 100% of 180. Therefore, we write 180 as 100%
$180 x 0.20 = $36$180 - $36 = $144
60% of 300 = 180 dollars