C#: Multiply Decimal with Float?

I want开发者_如何学C to perform the following operation:

decimal = decimal? * float / 100

What's the most efficient way to do this?

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Do you want the result as a float

var result = ((float)d) * f / 100;

or as a decimal

var result = d * ((decimal)f) / 100;

I certainly question the mixing of decimal and float types though. Some context would help!