We can use the formula for future value of an annuity to find the value of the stock bonus after 20 years:
FV = PMT * ((1 + r)^n - 1) / r
where PMT is the annual payment ($1,000), r is the interest rate (15% or 0.15), and n is the number of periods (20 years).
FV = $1,000 * ((1 + 0.15)^20 - 1) / 0.15
FV = $1,000 * (9.136 - 1) / 0.15
FV = $1,000 * 55.573
FV = $55,573
Therefore, the value of the stock bonus in 20 years will be $55,573. Answer: $55,573 (rounded to the nearest dollar).