The credit is $1900. But if the stock closes at $110 on expiry day you are short the 125 puts - which are ITM by $15.00. Buy-to-close the puts for $1500.00. Without taking into account bid/ask spread or commissions. $1900 - $1500 = $400 net profit.
Hope you are not signing up for more Interactive Trader workshops, or hand them your money to trade for you.