是 income 而不是本加利

100,000 = 100 K
h = house

[100k - h]/3 * (4/100) + [100k - h]/3* (12/100) = 320

Taking [100k - h]/3 * (4/100) as a factor

[100k - h]/3 * (4/100) *[ 1+3] = 320

[100k - h]/3 * (4/100)*4 = 320

[100k - h]*16/100 =320 *3

100k - h = (320*3*100)/16

h= 96000

1/3*(10000-x) * 4%+ 2/3*(10000-x) * 6%=320
x = 94000

原题是David used part of $100,000 to purchase a house. Of the remaining portion, he invested 1/3 of it at 4 percent simple annual interest and 2/3 of it at 6 percent simple annual interest. If after a year the income from the two investments totaled $320, what was the purchase price of the house?
少了一个1/3 和2/3

https://gmatclub.com/forum/david-used-part-of-100-000-to-purchase-a-house-of-the-remaining-219232.html

Think the original question posted has missing parts. See above for reference.

请问这个有两个单利，是同一portion的么？