Raul is selling coupon books. He started with 50 coupon books and has already won a prize for selling at least 10 coupon books. The total amount of money Raul will make from selling x coupon books is represented by a function. f(x)=20xf(x)=20x What is the practical domain of the function if Raul sells 50 coupon books?1. All integers from 0 to 50, inclusive2. All real numbers3. All integers from 10 to 50, inclusive4. All multiples of 20 between 0 and 1000, inclusive

Option 3.

Step-by-step explanation:

The given function is

where, x is number of coupon books.

We have to find the practical domain for the given function.

Domain : The set of input values is called domain.

It is given that Raul is selling coupon books. He started with 50 coupon books and has already won a prize for selling at least 10 coupon books.

The number of coupon books can not be a decimal or fraction value. It means the values of x are integers.

The value x is all integers from 10 to 50.

Hence, the correct option is 3.