3. [-/2 Points] DETAILS LARPRECALCRMRP7 3.5.044. The sales S (in thousands of units) of a cleaning solution after x hundred dollars is spent on advertising are given by the following. S = 10(1 - ekx) When $525 is spent on advertising 3000 units are sold. (a) Complete the model by solving for k. (Round your answer to 4 decimal places.) K = (b) Estimate the number of units that will be sold if advertising expenditures are raised to $825. units Submit