Question 1036937
Let's call the amount to invest at 6% x. Then, the amount at 18% will be 80,000-x:
0.06x+0.18(80,000-x) = 0.15(80,000)
0.06x+14,400-0.18x = 12,000
-0.12x = -2,400 Divide both sides by 0.12 and remember -/- = +
x = 20,000 this is the amount at 6%. And the amount at 18%:
80,000-20,000 = 60,000 is at 18%