Rickey Stahl earned royalties from writing books on a part$-$time basis. He did all his writing at home in his kitchen. His expenses included

Paper, Pencil, Supplies $-$ $$80$

Typing Services $-700$

Rent on apartment $-600$

Rickey also had to make several trips to the publisher's offices under his royalty contract. Airfare, $50\%$ of the meals, and lodging for these trips cost $$900.$ How much can Rickey deduct for adjusted gross income? Ans: $1,680$