A mail order firm sends 70% of its orders by a parcel service that delivers late only

Question:

A mail order firm sends 70% of its orders by a parcel service that delivers late only 2% of the time. It sends the other 30% by a combination bus service and local transportation that delivers late 7% of the time. Find the
(a) The probability that an order will be delivered late.
(b) The probability that an order delivered late was sent by the parcel service.