solve the problem

[10 points) Suppose 25% of the population were UDP packets, 25% were TCP packets, and the rest were ICMP packets. Also, suppose that stratified random sampling method was adopted, where any UDP packet was given twice the chance of being chosen to be in the sample S than any TCP packet, and any TCP packet in turn had twice the chance of being chosen to be in $ than any ICMP packet. What were the odds of an arbitrary ICMP packet of being chosen to be in the collected sample S