An investor has $621,000 to invest in bonds. Bond A yields an average of 8% and the bond B yields 7%. The investor requires that at least 5 times as much money be invested in bond A as in bond B. You must invest in these bonds to maximize his return. This can be set up as a linear programming problem. Introduce the decision variables:

x= dollars invested in bond A y= dollars invested in bond B

Compute x+y.

$ _______ . Round to the nearest cent.