I am getting a different price from GCP calculator. Almost $2000.
In your example, 10functions por Second, so each function is taking 1000ms to finish.
2592000s in a month * 10invocation = 25920000 invocations month, running with a 1GB function and 500kb of network bandwidth (out).
https://cloud.google.com/products/calculator/#id=555e1af7-c8...