Final answer:
To find 80% of the original price, rewrite 80% as a decimal by dividing it by 100. The function g(x) that finds 80% of x is represented by g(x) = 0.8 * x.
Step-by-step explanation:
To find 80% of the original price, we can rewrite 80% as a decimal. 80% is equal to 0.80. Therefore, the function g(x) that finds 80% of x is represented by option C, g(x) = 0.8 * x.