Need help with B only please $3.$ E$-$book Breakeven Analysis. Eastman Publishing Company is considering publishing an electronic textbook about spreadsheet applications for business. The fixed cost of manuscript preparation, textbook design, and web site construction is estimated to be $\backslash (\backslash$$ $160,000\backslash ).$ Variable processing costs are estimated to be $\backslash (\backslash$$ $6\backslash )$ per book. The publisher plans to sell single$-$user access to the book for $\backslash (\backslash$$ $46\backslash ).$ a$.$ Build a spreadsheet model to calculate the profit$/$loss for a given demand. What profit can be anticipated with a demand of $3,500$ copies? b$.$ Use a data table to vary demand from $1,000$ to $6,000$ in increments of $200$ to assess the sensitivity of profit to demand.