At a selling price of sh. 400 per unit, the expected sales of a product would be 10000 units, but sales would fall to 8000 units if the selling price roses to sh. 500. The demand function is estimated to be a linear model. The total cost function is c(x) =15000+18x where x is number of units. i) Determine the total profit function (ii) Determine the unit sales and price which will maximize profit and calculate the maximum profit.​

On coral island in 2012, the labor force is 12,000, the unemployment rate is 10 percent, and the labor force participation rate is 60 percent. during 2013, 200 unemployed people found jobs and the working-age population increased by 1,000. the total number of people in the labor force did not change. the working-age population at the end of 2013 was the unemployment rate at the end of 2013 was round up to the second decimal. the labor force participation rate at the end of 2013 was round up to the second decimal.