how to RPAD * into amount in word in fix length

working on check.  There is a line with amount in word e.g.
TWO HUNDRED and FORTY DOLLAR and SIXTY CENT

my requirement is to add * at the end up to end of the line. 
e.g.
TWO HUNDRED and FORTY DOLLAR and SIXTY CENT ***********************************

So I do this <?xdoxslt:rpad(C_WORD_AMOUNT,80,'*')?>   I though it will work perfectly but that is not the case.  I guess the * must in in smaller font than the amount in word.   I will get something like

PAY TWO HUNDRED and TEN DOLLAR ********************************************
or
PAY TWO HUNDRED AND TEN DOLLAR and SIXTY CENT ********************************************