How to convert decimal figure into words

Hello,

I created a calculated field in reporter writer on GP, the field is to convert currency amount into word.

But the result I got was converting only the whole number and leaving the decimal number has figure.

E.g If the currency amount is  =N=12,000.89k 

The amount in word that it will show is Twelve thousand naira and 89kobo

Please I need help on how it will convert the decimal value in words too.

Thank you and God bless.