Need help with both questions. C language is preferred.

1. Write a program using a for loop that read 10 numbers form the keyboard and find their sum. Write a function called average which returns the average base on the sum of the 10 numbers. (30 points) 2. Write a function called test_number which reads a number (num) between 1 and 10. If the value is 10, square num1. If the value is 9, read a new value into numl. If inputed value is not (9 0r 10) multiply numl by 99 and print out the result. Implement your code using if statements only. (30 point)