TopangaCo. acquired a patent for $5m on January 1, 2020, which is estimated to be amortized using the straight-line method over 5 years with a residual value of $0. At the end of 2021, our company sells the patent for $1.8m. What would be the loss from this sale? Give your answer to 1 decimal place with the negative signs. For example, if the loss is $1.2m, put your answer as -1.2.