Modifies the value stored in a variable by multiplying
it by a given value.
Parameters:
symbol -
A symbol object identifying a variable in the current context. The
variable must contain a numeric value.
aValue -
A numeric object represeting the value to be multiplyed by
symbol.
Returns:
The new value of the variable.
Modifies the contents of the variable identifyed by
symbol by multiplying the
value it contains with value.
The variable binded to symbol is expected to
contain a numeric object.
