Mark has $100,000 to invest. His financial consultant advises him to diversify his investment in three types of bonds: short-term, intermediate-term, and long-term. The short-term bonds pay4%, the intermediate-term bonds pay5%, and the long-term bonds pay6% simple interest per year. Mark wishes to realize a total annual income of5.1%, with equal amounts invested in short- andintermediate-term bonds. How much should he invest in each type of bond?