Please help me with this mathematical algorithm [duplicate]

This question already has an answer here:

• Find all combinations of coins when given some dollar value 21 answers

Please help me to answer this following question.

In Hogwarts the currency is made up of galleon (G) and Sickle (s), and there are seven coins in general circulation: 1s, 5s, 10s, 25s, 50s, G1(100s), and G2(200s) It's possible to make G3.5 in the following way: 1xG2 + 1xG1 + 1x30s + 1x10s + 1x5s + 5x1s How many different ways can G3.5 be made using any number of coins?

Thank you!