A total of $20,000 was invested in two certificates of deposit at simple annual interest rates of 6 percent and 10 percent, respectively. If the total interest on the two certificates was $1,440 at the end of one year, what fractional part of the $20.000 was invested at the higher rate?	Choose one.
A) 3/8
B) 9/10
C) 1/2
D) 3/5
E) 3/4
x * 6/100 * 1 + (20000 - x) * 10/100 * 1 = 1440   6x - 8x = 144000 - 200000   =&gt; -2x = -4000   =&gt; x = 2000   So 18000/20000 = 9/10   Answer - 9/10
<result>B</result>
A total of $20,000 was invested in two certificates of deposit at simple annual interest rates of 6 percent and 10 percent, respectively. If the total interest on the two certificates was $1,440 at the end of one year, what fractional part of the $20.000 was invested at the higher rate?