Answer:
24.75%
Step-by-step explanation:
the customer will be taxed in two different rates:
long term capital gains = $50 - $40 = $10 per stock x (1 - 15%) = $8.50
interests are taxed as normal income = (4 x $0.50) x (1 - 30%) = $1.40
total after tax gains = $9.90
after tax rate of return = $9.90 / $40 = 0.2475 = 24.75%