How to calculate the difference in a triple repurchase of currencies?

Question

Mathematics

Although I am a programmer, I am a very bad mathematician...
There is an exchange where you can buy and sell EUR/USD, EUR/RUB, USD/RUB currencies.
More precisely:
1. We buy 10 EUR at 1.15 USD each
2. We sell 5 EUR at 73.6 RUB each (only 5 EUR is available at this price)
3. We sell 368 RUB at 0.016 USD each
How to calculate the profit from such resales?

Answer 1

20.28 = 20-(10*1.15)+((5*73.6)+(5*73.6))*0.016