Over two summers, ray saved $900 and $500. the polynomial 900x 2 + 500x represents his savings at the beginning of the third year, where x is the growth factor. (the interest rate r is x - 1.) what is the interest rate he needs to start the third year with $1600 in savings?
a. 8.4%
b. 264%
c. 0.1%
d. 1.1%