A person is the manager of a firm. He is considering manufacturing a new product, so he asks the accounting department for cost estimates and the sales department for sales estimates. After he receives the data, he must decide whether to go ahead with production of the new product. Analyze the following data $($find a break$-$even quantity$)$ and then decide what the manager would do in this case. Also, write the profit function.

$C(x)=160x+1000$ and $R(x)=140x$