Why does adding two values in nVelocity always returns zero? -

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I am trying to add two values ​​to velocity and it always returns to 0. What am I doing wrong? 

  #set ($ tmpPrice = $ orderItem.ExtendedPrice + $ discountAmount)

Both $ orderItem.ExtendedPrice & amp; The $ discount allowance is that decimal numbers, such as: 99.99

try $ tmpPrice = ($ OrderItem.ExtendedPrice + $ discountAmount)


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