Error when generating PDF

DOCUMENT();

loadMacros(
"PGstandard.pl",
"MathObjects.pl",
"parserRadioButtons.pl",
"contextCurrency.pl"
);

TEXT(beginproblem());

$showPartialCorrectAnswers = 0;

Context("Currency");

$A = Currency(random(7.05, 20.91, 0.35));

$product1 = ($A * 8.875) /100;
$product2 = ($A * 8.875 + 10.15) /100;
$product3 = ($A * 8.875 + 20.23) / 100;
$product4 = ($A * 8.875 - 10.02) / 100;

# labels=>"ABC" is required in order to solve the student answer display problems
$multchoice = RadioButtons(
  ["$product1",
   "$product2",
   "$product3",
   "$product4"],
   "$product1",labels=>"ABC");


## Use $DOLLAR for "$" and $PERCENT for "%"
Context()->texStrings;
BEGIN_TEXT

You order a Veggie Burrito from Chipotle for \($A\); if New York State charges 8.875$PERCENT, how much do you pay in sales tax for your burrito?

$PAR \{$multchoice->buttons()\}

END_TEXT
Context()->normalStrings;

ANS($multchoice->cmp());

ENDDOCUMENT();