In an economy, the supply curve of labor is: S = -100 200w where w is the after-tax wage rate. Assume that the before-tax wage rate is fixed at $10.

a) Write a formula for tax revenues as a function of the tax rate and sketch a graph of the function with the tax rate on the x-axis and tax revenues on the y-axis. Hint: w=(1-t)*10 where t is the tax rate, and that tax revenues are the product of hours worked, the gross wage, and the tax rate.