Answer: There is 680% increase for the fund.
Step-by-step explanation:
Since we have given that
Number of shares they purchased = 1000
Cost of per share at the time of their marriage = $10
So, Amount of fund will be
![1000\times 10=\$10000](https://tex.z-dn.net/?f=1000%5Ctimes%2010%3D%5C%2410000)
Cost per share after 30 years = $78
So, Amount of fund will be
![78\times 1000=\$78000](https://tex.z-dn.net/?f=78%5Ctimes%201000%3D%5C%2478000)
Percentage of increase for the fund will be given as
![\frac{78000-10000}{10000}\times 100=680\%](https://tex.z-dn.net/?f=%5Cfrac%7B78000-10000%7D%7B10000%7D%5Ctimes%20100%3D680%5C%25)
Hence, there is 680% increase for the fund.