Small business estimates that the value​ v(t) of a copy machine is decreasing according to the function defined by upper v left parenthesis t right parenthesis equals 11200 left parenthesis 4 right parenthesis superscript negative 0.12 tv(t)=11200(4)−0.12t​, where t is the number of years that have elapsed since the machine was​ purchased, and​ v(t) is in dollars. when will the value of the machine be ​$28002800​?