Table: Excellence Publishing

$\backslash$table$[[$Number of Workers per Year,Number of Books Edited per Year$],[4,16,000],[5,,19,000],[6,21,200],[7,22,800],[8,23,700],[9,24,200]]$

Initially each edited book sells for $$50.$ Suppose that there is an increase in the demand for edited books, so that each edited book now sells for $$70.$ How many people will the company bire per year as editing staff if the salary is $$47,000$ per staff member?

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$7$

$8$