The SaferGlass Co. makes windshields for the automotive industry. It wants to develop a new product with shatterproof glass to increase safety. The development of the new glass requires them to change their production process significantly. The company has developed a list of possible ways of implementing the production process changes, along with estimates of how each would affect the production and sales costs. Based on these estimates, the table below shows the value of R&D projects that provide at least a certain social rate of return. Every investment in R&D would have an additional 3% social return: that is, an investment that pays at least a 4% return to the glass company will pay at least 7% return for society as a whole.

Social Rate of Return	Value of R&D Projects That Provide at Least This High a Private Rate of Return to Safer Glass Co.
15%	$350
12%	$400
9%	$450
6%	$500
3%	$550

If the opportunity cost of financial capital for SaferGlass Co. is 9%, the company will invest ______ in R&D if it receives both the private and social benefits of this investment.