Lisa Chen invested $24,000, part at 8% and the rest at 7.2%. How much did she invest at each rate if her income from the 8% investment is two thirds that of the 7.2% investment?

Question

Lisa Chen invested $24,000, part at 8% and the rest at 7.2%.  How much did she invest at each rate if her income from the 8% investment is two thirds that of the 7.2% investment?

anonymous · Answer

How much of an 18% solution of sulfuric acid should be added to 360 ml of a 10% solution to obtain a 15% solution?

amistre64 · Answer

e+r = 24000 ; e = 24000 - r

e(.08) = 2r(.072)/3

amistre64 · Answer

im get r = 15000; but id have to dbl chk that

anonymous · Answer

$15,000 at 7.2% and $9,000 at 8% thats what i got

amistre64 · Answer

15000 + 9000 doesnt = 45000 tho :)

amistre64 · Answer

...... nvr mind; my mind was lost lol

amistre64 · Answer

15 at 7.2 and 9 at 8% looks good

anonymous · Answer

thanks bro!