# Model with composite functions

Given two basic functions that model a real-world situation, compose them in order to model a more complex situation.

### Problem

A statistician observed the health systems of several countries. She identified a few statistical associations and modeled them:
FunctionInputOutput
CAverage daily consumption of cigarettes per person, xNumber of sick people out of 1000, C, left parenthesis, x, right parenthesis
SNumber of sick people out of 1000, kThe country's health expenses per person, S, left parenthesis, k, right parenthesis
PThe country's health expenses per person, rThe price of basic health insurance, P, left parenthesis, r, right parenthesis
According to the statistician's findings, which of the following represents the price of basic health insurance as a function of the number of sick people?
Please choose from one of the following options.
Get 3 answers correct in a row