any. a. Ignoring taxes and commissions, calculate your rates of return if the stock rises to $90 a share and if it declines to $20 a share assuming you pay cash for the stock. Rate of return if the stock rises to $90 a share: Rate of return if the stock declines to $20 a share: Rate of return if the stock rises to $90 a share: Rate of return if the stock declines to $20 a share: %