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AMPScript is loosely typed. You may want to utilize the AttributeValue() functions so you can detect empty values in either number (using the empty() function). Here's how do to it:

%%[
var @price, @qty, @extPrice
/*
set @price = AttributeValue("price")
set @qty = AttributeValue("qty")
*/
set @price = "12.34"
set @qty = "3"

if empty(@price) or empty(@qty) then
  set @extPrice = "0.00"
else
  set @extPrice = multiply(@price,@qty)
endif

]%%
<br>extPrice: %%=formatNumber(@extPrice,D2)=%%

Output

extPrice: 37.02 

Reference

• Empty()
• AttributeValue()
• Multiply()
• FormatNumber()