Amy’s retirement portfolio contains only stocks and bonds. At the beginning of 2016, her portfolio had an allocation of 60% stocks and 40% bonds. Over the course of 2016, the total value of her portfolio increased by 8%, with the value of her stock holdings increasing by 10%. By what percent did the value of her bond holdings increase?  Select the correct option:
A) 4%
B) 5%
C) 6%
D) 7%
E) 7.5%
Thus total value of 5%ond at the end of 2016 is 420 ( ie, 1080 - 660 )   So, Per unit value of 5%ond at the end of 2016 is  420/40= 
<gadget id="calculator"> 420/40</gadget>
<output>21/2 = around 10.5</output>
10.50   Hence, percentage increase is 0.50/10∗100=5%, answer will be (5%)
<result>B</result>
Amy’s retirement portfolio contains only stocks and bonds. At the beginning of 2016, her portfolio had an allocation of 60% stocks and 40% bonds. Over the course of 2016, the total value of her portfolio increased by 8%, with the value of her stock holdings increasing by 10%. By what percent did the value of her bond holdings increase?