Rick is a genius mechanical engineer working on world changing project in his own garage. To continue on his project work he needs a long iron chain with at least 15 links. Rick searches his garage for the long chain. But instead of a long chain he found 5 chains with 3 links each. After the failed search Rick decided to use those 5 chains to form a long chain. In order to do that, he needs to open and then weld the links. As soon as Rick decided to link those chains, he realized opening a link costs $1 and wielding a link costs $3. At this critical stage of the project he wants to save as much money as he can.
What is the minimum amount Rick has to spend to make the long chain?

NetPoll | Rick is a genius mechanical engineer working on world changing project in his own garage. To continue on his project work he needs a long iron chain with at least 15 links. Rick searches his garage for the long chain. But instead of a long chain he found 5 chains with 3 links each. After the failed search Rick decided to use those 5 chains to form a long chain. In order to do that, he needs to open and then weld the links. As soon as Rick decided to link those chains, he realized opening a link costs $1 and wielding a link costs $3. At this critical stage of the project he wants to save as much money as he can. What is the minimum amount Rick has to spend to make the long chain? https://netpoll.in/HW80UX2Z1K