【求解一道prep上的数学题】感谢~~

nicholecc

An investment of d dollars at k percent simple annual interest yields $600 interest over a 2-year period.  In terms of d, what dollar amount invested at the same rate will yield $2,400 interest over a 3-year period?

求解吖~~~thanks~~

nicholecc

fly   thank you very very much!!!!!!!

fly12404

simple annual
d 一年賺 600 /2 =300
設另一投資為x
x　一年賺2400/3=800
x/d = 800/ 300 =8/3
=>x = 8/3d
: )
hope it help !