Please help me fast and show all your work please thx

Frank owns a $141,000 home, for which he has a 30-year mortgage in the amount of $700 a month. once he has paid off mortgage, how much will he have paid in investment? a. $111,000 b. $109,000 c. $120,000 d. $141,000

I’m really confused and need your assist me with this question i’ve never been taught

Shared decision making is always a positive strategy to take