The balance increase for the investments made by Enrique, between years 62 and 68 will be $14,871.
A monetary engagement, with an intention of getting the required or expected rate of return over a predetermined financial period, is known as an investment.
The return for Enrique's investment at the age of 62 years will be,
[tex]\rm Investment\ Value= 1000(\dfrac{1}{1+0.08})^4^2\\\\\rm Investment\ Value= \$25,339[/tex]
Similarly, the investment value at the age of 68 years will be $40,210.
So the increase in the investment value between these years will be,
40210-25339=$14,871.
Hence, the value of Enrique's investment is as computed above.
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