Using Function Notation to Model a Scenario
The amount of garbage, G\displaystyle {G}, in tons per week, produced by a city with population p\displaystyle {p}, measured in thousands of people, is given by G=f(p)\displaystyle {G}={f{{\left({p}\right)}}}

The town of Tola has a population of 25,000 and produces 15 tons of garbage each week.
Which of the following best represents this scenario as an equation involving the function f\displaystyle {f}.