If the intquantity and decprice variables contain the numbers 3 and 15.75, respectively, the condition if intquantity > 0 andalso intquantity < 10 orelse decprice > 20 will evaluate to

if intquantity > 0 andalso intquantity < 10 orelse decprice > 20 
expression evaluates to
 (3>0 and 15.75<10  or  15.75>20)
which, using priority of operations, "and" has a higher precedence than "or",
=>
( (3>0 and 15.75<10)  or  15.75>20)
=>
( false or false )
=> 
false