Write the problem as a mathematical expression.

Convert <math><mstyle displaystyle="true"><mn>40</mn><mi>%</mi></mstyle></math> to a decimal.

Multiply <math><mstyle displaystyle="true"><mn>0.4</mn></mstyle></math> by <math><mstyle displaystyle="true"><mn>85</mn></mstyle></math> .

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