The annual interest rate earned by an investment increased by 10 percent from last year to this year. If the annual interest rate earned by the investment this year was 9 percent, what was the annual interest rate last year?  Select:	A) 1 %	B) 1.1 %	C) 8.18 %	D) 10 %	E) 10.8 %

Rationale: "9 = 1.1 * x x = 8.18 % answer c )"
Answer: C