A clock gains 0.020 s/min. how many seconds will the clock gain in exactly six months, assuming 30 days are in each month

Total gain = (gain per minute) * (minutes in an hour) * (hours in a day) * (days in a month) * (Months required)

total gain = (0.020 s / min) * (60min/hour) * (24 hours/day) * (30 days/month) * (6 months)

total gain = 51840