Net profit 10% at the end of the year.

Linda is starting a new cosmetic and clothing business and would like to make a net profit of approximately 10% after paying all the expenses which include merchandise cost, store rent, employees’ salary, and electricity cost for the store.
She would like to know how much the merchandise should be marked up so that after paying all the expenses at the end of the year she gets approximately 10% net profit on the merchandise cost.

So far, I got:

/* Linda is starting a new cosmetic and clothing business and would like to make a net profit of approximately 10% after paying all the expenses. */

#include <iostream>
#include <cmath>
How do I write this as a C++ program?
What are you specifically having trouble with?
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