Consider a LoRaWAN node that uses SF$10/250$ KHz$.$ Assuming a code rate of $\frac{4}{5},$ answer

the following questions:

A$.$ Compute the symbol duration used by the node.

B$.$ Compute the data rate used by the node.

C$.$ If the payload sent by each message is $200B,$ how many messages per day can

the node send, if a duty cycle of $1\%$ is enforced.

D$.$ Suggest a way to double the number of messages that can be sent per day by

one node without changing the message size.