Let "x" be the number of $500 bills. Then the number of the $1000 bills is (26-x). The condition says 500x = 0.3*(500x + 1000*(26-x)). Simplify and solve for x: 500x = 150x + 7800 - 300x, 500x - 150x + 300x = 7800, 650x = 7800 ====> x == 12. Answer. 12 $500 bills and (26-12) = 14 $1000 bills.