Javascript Not Adding

<script>
	var myBox8 = document.getElementById('addon-28-bicycle-info[association-membership-1]').value;

		<?php
			$assoc = $pdo->prepare($association);
						
			try {
				$assoc->execute();
				$ass = $assoc->fetchAll();
			
				foreach ($ass as $as)	{
					$app = $as->physical_damage;	
				}
			}
			catch(PDOException $b) {
   				echo 'ERROR: ' . $b->getMessage();
			}	
		?>	
		if(myBox8 == 'yes' ) { myBox9 = <?php echo $app; ?> }
		else { myBox9 = 1 }

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var myBox8 = document.getElementById('addon-28-bicycle-info[association-membership-1]').value;
if(myBox8 == 'yes' ) { myBox9 = 0.90 }
else { myBox9 = 1 } 

Then I have:
var myResult = parseFloat(myResultSub) * parseFloat(myBox9);

myBox9  always uses 1 even though  the value of myBox8 is "yes"

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