(Solved): An indium-gallium-arsenide-nitrogen alloy developed at Sandia National Laboratory is said to have ...

An indium-gallium-arsenide-nitrogen alloy developed at Sandia National Laboratory is said to have potential uses in electricitygenerating solar cells. The new material is expected to have a longer life, and it is believed to have a $$40\%$$ efficiency rate, which is nearly twice that of standard silicon solar cells. The useful life of a telecommunications satellite could be extended from 10 to 15 years by using the new solar cells. What rate of return could be realized if an extra investment now of $$\$940,000$$ would result in extra revenues of $$\$450,000$$ in year $$11,\$500,000$$ in year 12 , and amounts increasing by $$\$50,000$$ per year through year 15 ? The rate of return that could be realized was $$\%$$