The return on the Rush Corporation in the state of recession is estimated to be $-25\%$ and the return on Rush in the state of boom is estimated to be $33\%.$ The return on the Oberman Corporation in the state of recession is estimated to be $42\%$ and the return on Oberman in the state of boom is estimated to be $-17\%.$ Given this information, what is the covariance between Rush and Oberman if there is a $0\mathrm{.}40$ probability that the economy will be in the state of boom and a $0\mathrm{.}60$ probability that the economy will be in the state of recession.