ASAP. Please help

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Prepare two additional estimates of Pearson's cost of common equity using the constant dividend growth rate model and substituting growth rates in dividends that are 25 percent lower and higher than the estimated - 1.70 percent (i.e., rates for g equal to -2.13 percent and -1.28 percent). Prepare two additional estimates of Pearson's cost of common equity using the constant dividend growth rate model and substituting growth rates in dividends that are 25 percent lower and higher than the estimated - 1.70 percent (i.e., rates for g equal to -2.13 percent and -1.28 percent)