Question: if ( $mark > = 7 5 ) $result = + + ; else if ( $mark > = 5 0 && $mark

if ($mark >=75)
$result ="++";
else if ($mark >=50 && $mark <=74)
$result ="+";
else if ($mark >=40 && $mark <=49)
$result ="*";
else if($mark <40)
$result ='-';

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