April 13 (Reuters) - Afterpay Holdings Ltd AFY.AX -
* Quarterly underlying merchant sales of $144.9m, up 41% on q2
* Annualised underlying sales are estimated to be greater than $700 million
* Nab has approved an additional $20m increase to funding facility Source text for Eikon: ID:nASXchc8lJ Further company coverage: AFY.AX