1780 = 2000 * (1+i)^1 isnt this the correct formula? so why is 11% wrong?

You invested $2,000 in the stock market one year ago. Today, the investment is valued at $1,780. What return did you earn? What return would you need to get next year to break even overall? Note: Do not round intermediate calculations. Round your answers to 2 decimal places. Negative answers should be indicated by a minus sign. Answer is complete but not entirely correct