can someone answer this question please and explain the working

6. Sonia needs her house repainted, but it will cost $14 000. A company offers to paint it provided she pays 10% deposit and 10%p.a. simple interest on the balance. If she agrees to equal monthly repayments over 2 years: (a) how much are the monthly repayments? (2) (b) how much extra did Sonia pay by agreeing to this deal? (1) Page 1 of 2