The equation which represent total amount of income he earns from selling book is, [tex]A=50000+\frac{109}{100}bn[/tex]
Since, Selling price of one novel is n dollars
So, selling price of b books is, [tex]n*b=nb[/tex]
Since, he receives 9% commission on each book sale.
So, total commission he receives on selling of b books is,
[tex]nb*\frac{9}{100}=\frac{9}{100}nb[/tex]
And also he received a bonus of $50,000 to sign the contract to write the book,
So, total amount of income he earns is represented by A,
[tex]A=50000+bn+\frac{9}{100}bn\\\\A=50000+\frac{109}{100}bn[/tex]
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