The Fashion Store has $12,000 available each month for advertising. Newspaper ads cost $600 apiece and no more than 40 can be run per month. Radio ads cost $300 each and no more than 50 can run per month. TV ads cost $1800 a piece, with a maximum of 6 available each month. Approximately 3000 women will see each newspaper ad, 1800 will hear each radio ad, and 14,000 will see each TV ad. How much of each type of advertising should be used if the store wants to maximize exposure? How many newspaper ads should be placed?