[rules-users] How to put "Power" in Formula box of THEN ?

[zeeshan]

oops......now I tried by putting $ before sumAssured....still same error.... 
*[DeathBenefitRule] Unable to Analyse Expression
$deathBenefit.setSumAssured( $sumAssured * ( 1 - (1 / (Math.pow ( (1 +
($interestRate/100),$policyTerm-$policYear+1) ) ) ) ) / (1 - (1 / (Math.pow
( (1 + ($interestRate/100),$policyTerm) ) ) ) ) ); drools.update(
$deathBenefit );: [Error: unable to resolve method using strict-mode:
org.drools.spi.KnowledgeHelper.,$policyTerm()] [Near : {...
($interestRate/100),$policyTerm-$policYear+1) ) ) ....}] ^ [Line: 1, Column:
91]*


the source code  -->   *1.	|	rule "DeathBenefitRule"
2.	|	    dialect "mvel"
3.	|	    when
4.	|	        $deathBenefit : DeathBenefitFactModel( $sumAssured :
sumAssured, $interestRate : interestRate, $policYear : policYear,
$policyTerm : policyTerm)
5.	|	    then
6.	|	        $deathBenefit.setSumAssured( $sumAssured * ( 1 - (1 / (Math.pow
( (1 + ($interestRate/100),$policyTerm-$policYear+1) ) ) ) ) / (1 - (1 /
(Math.pow ( (1 + ($interestRate/100),$policyTerm) ) ) ) ) );
7.	|	        update( $deathBenefit );
8.	|	end*

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