16.5 cents in decimal form is 0.165
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The way you wrote it is the standard form.
It is: 0.4/165 times 100 = 0.24% recurring decimal '0.24'
A nickel is 5 cents, so 33 of them are worth 33*5 = 165 cents, or $1.65
12/55
1 million < 165 so 6 digits would be enough.