A company has a monthly budget of x dollars. Every month, $20,700 of the monthly budget is spent on salaries. One-fifth of the remaining budget is spent on office supplies. Which function can be used to calculate the amount, in dollars, spent on office supplies? f(x)= 20,700 − (x/5)
f(x)= 20,700 + (x/5)
f(x)= x+20,700/5
f(x)= x−20,700/5
Plz help, and if you could add a step by step explanation that would be greatly appreciated!

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