What investment per month does Patrick need to make at the end of each month into his savings account over the coming 18 months to reach his vacation goal of $8,000 if he is getting 9% APR on his account? Round to the nearest cent. Make sure you enter your answer using commans to soparate thousands, do not enter a S sign, and What investment per month does Patrick need to make into his savings account? use two decimals. E.g. if your answer is $1,000 then you enter 1,000.00)