1. Belinda borrowed $17,500 at simple interest rate of 4.60% p.a. from her parents to start a business. At the end of 3 months, she paid them $2,700 and $7,600 at the end of 7 months. How much would she have to pay them at the end of 18 months to clear the balance? Use 'now' as the focal date.

2. Prisha had to make a payment of $1,500 in 10 months and $1,200 in 17 months, to a raw material supplier. What single payment in 4 months would settle both these payments? Assume a simple interest rate of 6.25% p.a. and use 4 months from now as the focal date.