Based on the information given, IBM's cost of equity capital is 12.56%
Share Price = Dividend Next Year / [Cost of Equity - Growth Rate]
$90 = $5 / [R - 0.07]
$90 * {R - 0.07] = $5
{R - 0.07] = $5/$90
R - 0.07 = 0.055556
R = 0.055556 + 0.07
R = 0.125556
R = 12.56%
In conclusion, IBM's cost of equity capital is 12.56%
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