Multiple Styles in Markup

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   Is there a way to add multiple styles to a markup tag?

For example, I have the following markup:

<Page>
    <Page.Resources>
        <Style x:Key="TotalRow">
            <Setter Property="Border.BorderBrush" Value='Black'/>
            <Setter Property="Border.BorderThickness" Value='0,1,0,0'/>
            <Setter Property="TextBlock.FontWeight" Value='Bold'/>
        </Style>
        <Style x:Key="Negative">
            <Setter Property="TextBlock.Foreground" Value='Red'/>
        </Style>
    </Page.Resources>

    <Grid Margin="30">
        <Grid.ColumnDefinitions>
            <ColumnDefinition MinWidth="50" MaxWidth="200"/>
            <ColumnDefinition MinWidth="50" MaxWidth="150" />
         <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>

         <TextBlock Grid.Column="0" Grid.Row="0" VerticalAlignment="Center" FontSize="14">Base Contract</TextBlock>
        <TextBlock Grid.Column="1" Grid.Row="0" VerticalAlignment="Center" FontSize="14" HorizontalAlignment="Right">500.00</TextBlock>
         <TextBlock Grid.Column="0" Grid.Row="1" VerticalAlignment="Center" FontSize="14">Approved Changes</TextBlock>
        <TextBlock  Style="{StaticResource Negative}" Grid.Column="1" Grid.Row="1" VerticalAlignment="Center" FontSize="14" HorizontalAlignment="Right">-600.00</TextBlock>
        <Border Style="{StaticResource TotalRow}" Grid.Column="0" Grid.Row="2">
            <TextBlock Grid.Column="0" Grid.Row="2" VerticalAlignment="Center" FontSize="14">Revised Contract</TextBlock>
        </Border>
        <Border Style="{StaticResource TotalRow}" Grid.Column="1" Grid.Row="2">
            <TextBlock Grid.Column="1" Grid.Row="2" VerticalAlignment="Center" FontSize="14" HorizontalAlignment="Right">-100.00</TextBlock>
        </Border>
    </Grid>
</Page>

The -600.00 cell has the Negative style applied (works as expected), but I would like to be able to add the Negative style AND the TotalRow style to the bottom right cell (-100.00). I've tried a few variations like:

 Style="{StaticResource TotalRow, Negative}" 
 Style="{StaticResource TotalRow, StaticResource Negative}" 

Style="{StaticResource TotalRow}, {StaticResource Negative}" 
 Style="{StaticResource TotalRow}"  Style="{StaticResource Negative}" 

With no success. Is this possible, or do I need to create a third style that encapsulates TotalRow and Negative?

Thanks.