Understanding the Approximate Yield Equation

The formula for the approximate yield of an investment can look intimidating, but it's really just a function of three things: $(1)$ average current income, $(2)$ average capital gains, and $(3)$ the average value of the investment. Based on the information in the table, compute each of these values for the two stocks over a $3-$year period and enter the values into the bottom half of the table.

$\backslash$table$[[,$Stock $1,$Stock $2],[$Expected average annual dividends $(2012-2014),$$$1\mathrm{.}20,$$$2\mathrm{.}90$