You can show the Invoice rate of a placement in a e-mail template with the following code: 

<cx:let name="finance" value="$activity.toJob" invoke="financeForTag:"> 
<cx:parameter name="0" value="invoiceRateTag"/>
<cx:write value="$finance.amount" numberFormat="#0.00"/>
<cx:write value="$finance.toUnitNode.value"/>
</cx:let>

For the purchase rate use:

<cx:let name="finance" value="$activity.toJob" invoke="financeForTag:"> 
<cx:parameter name="0" value="wageRateTag"/>
<cx:write value="$finance.amount" numberFormat="#0.00"/>
<cx:write value="$finance.toUnitNode.value"/>
</cx:let>
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