SOLUTION: Lucy has invested some money invested at 18% and three times as much invested at 12%. her total annual income from the 2 investment is 85,000 pesos. how much was invested at each r

Question 149677: Lucy has invested some money invested at 18% and three times as much invested at 12%. her total annual income from the 2 investment is 85,000 pesos. how much was invested at each rate?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
.18x+.12*3x=85,000
.18x+.36x=85,000
.54x=85,000
x=85,000/.54
x=157,407.40 invested @ 18%
3*157,407.40=472,222.20 invested @ 12%
proof:
.18*157,407.40+.12*472,222.20=85,000
28,333.33+56,666.67=85,000
85,000=85,000
RELATED QUESTIONS
Lucy has some money invested at 18% annual interest and three times as much invested at... (answered by josmiceli)

Lucy has some money invested at 18% annual interest and three as much invested at 12%.... (answered by checkley77)

Mr.Caminiti has some money invested at 4% and three times as much invested at 6%.Her... (answered by josmiceli)

Mr.Caminiti has some money invested at 4% and three times as much invested at 6%.Her... (answered by solver91311)

Roberto invested some money at 8%. and then invested $5000 more than twice this amount at (answered by robertb)

Roberto invested some money at 6%, and then invested $4000 more than twice this amount at (answered by mananth)

Roberto invested some money at 8%, and then invested $2000 more than twice this amount at (answered by dragonwalker)

Roberto invested some money at 8%, and then invested $2000 more than twice this amount at (answered by scott8148)

A church building fund has invested money in two ways:part of the money at 3% interest... (answered by sachi)