A few years ago a couple purchased an office space by financing RA for n years, paying periodic installment of Rp with an interest of r% compounded bimonthly (every 2 months). They have made t payments and wish to know how much they owe on the mortgage at the end of t payments, which they are considering paying off with an inheritance they received. 1. Construct a mathematical model to illustrate the value owed on the loan after t payments. 2. Give an explicit formula for computing the current balance on the loan account after n periods. 3. If the couple signed the contract by financing R80000 for 10 years, paying periodic installments of R 1880 with an interest of 18% compounded binmonthly. What is thi current value on the mortgage after 6 months