The viewing window in a diving suit has an area of roughly 6…

The viewing window in a diving suit has an area of roughly 65 cm2.  If an attempt were made to maintain the pressure on the inside of the suit at 1 atm, what force (N) would the window have to withstand if the diver descended to a depth of 150 m.  Take the specific gravity of the water to be 1.05. Hint (Pressure change with depth):   

A retailer bought a number of shirts at a total cost of $180…

A retailer bought a number of shirts at a total cost of $180.  He is able to sell all but six of these shirts at a profit of $2 per shirt.  If he takes all the money earned by selling these shirts (including the profit) he can buy 30 more shirts than he did the first time.  What is the cost he is paying per shirt?