A club decides to sell T-Shirts for 15$ as a fund-raiser. It cost $20 plus $9 per T-Shirt to make them. How many T-Shirts need to be made to make a profit of at least $150?

The expression for T-shirt production is 20+9T

The expression for total price of selling the T-shirts is 15T

Profit = Total cost of selling - Total cost of buying

Profit = 15T - (20+9T)

Profit = 15T - 20 - 9T

Profit = 6T - 20

To make profit ≥150

6T - 20 ≥ 150

6T ≥ 170

T ≥ 170/6

T ≥ 28.3

The minimum number of T-shirts needed is 29 T-shirts