Suppose you want to estimate the proportion of cars that are sport utility vehicles (SUVs) being driven in Kansas City, Missouri,at rush hour by standing on the corner of i-70 and i-470 and counting SUVs. You believe the figure is no higher that 0.40. If you want the error of the confidence interval to be no greater than 0.03, how many cars should you randomly sample? Use 90% level of confidence.

*plz show me solution how to get the answer (not only answer)